[G-API] Extend compileStreaming to support different overloads

* Make different overloads

* Order python compileStreaming overloads

* Fix compileStreaming bug

* Replace

gin -> descr_of

* Set error message

* Fix review comments

* Use macros for pyopencv_to GMetaArgs
* Use GAPI_PROP_RW
* Not split Prims python stuff

G-API: oneVPL (simplification) source base commit

* oneVPL source initial

* Fix compilation

* Fix compilation path

* Fix NO VPL compile

* Fix unused vars

* Fix unused vars in example

* Simplify oneVPL search: no custom path & download

* Fix standalone GAPI

* Apply comments

[G-API] Expand PyParams to support constInput

* Wrap constInputs to python

* Wrap cfgNumRequests

* Fix alignment

* Move macro to the line above

[G-API]: Add serialization mechanism for cv::MediaFrame

* Stub initial interface

* Fix templates for deserialization

* Fix tests

* Disable a warning on windows

* Address review comments

* Change enable_ifs to other template helpers

* Resolve ambiguous template

* Fix warnings in docs

G-API: add documentation on serialization functionality

* Add documentation on serialization/deserialization

* Add docs on bind() methods

* Fix typo

* Docs refactoring

* Fix s11n docs

* Fix deserialize() docs

* Change deserialize docs

* Fix warning

* Address review comments

* Fix sample

* Fix warnings and errors

* Fix docs warnings

* Fix warnings

* Address review comments

* Add prefixes to snippets and fix indentation

* Address review comments and move snippets to a single file

G-API: Implement variant visit()

* Add variant visitor, use visitor for check compile args

* Fix GAPI UT: variant *compiler

* Aling apply_visior with std, fix indentations

* Fix compilation (included compiler_hints.hpp)

* Fix compilation (due gapi standalone)

* Fix compilation2 (Docs)

* Add Lambdas overload, Refactor visit()

* Add ReturnType auto deduction

* Fix comilation

* Fix compilation

* Fix warnings

* Try to fix MSVC14

* Fix docs

* Try fix Win compile

* Fix Docs again

* Revert GAPI empty input fix

* Apply comment for `tuple_element`

* Add std::decay for std::base_of to work arounf armv7 problem

* Apply review comments

* Apply review comments: added comment & removed unused args

* Fix docs compilation

G-API: Python. Desync.

* Desync. GMat.

* Alignment

G-API: Wrap render functionality to python

* Wrap render Rect prim

* Add all primitives and tests

* Cover mosaic and image

* Handle error in pyopencv_to(Prim)

* Move Mosaic and Rect ctors wrappers to shadow file

* Use GAPI_PROP_RW

* Fix indent

G-API: Extend python bindings

* Extend G-API bindings

* Wrap timestamp, seqNo, seq_id
* Wrap copy
* Wrap parseSSD, parseYolo

* Rewrap cv.gapi.networks

* Add test for metabackend in pytnon

* Remove int64 pyopencv_to

G-API: Support remote inference

* Extend MediaFrame to be able to extract additional info besides access

* Add API for remote inference

* Add default implementation for blobParams()

* Add default implementation for blobParams()

* Address review comments

* Fix any_cast usage

* Add comment on the default blobParams()

* Address review comments

* Add missing rctx

* Minor fix

* Fix indentation and comment

* Address review comments

* Add documentation

1) Document GFrame/MediaFrame (and also other G-API types)
- Added doxygen comments for GMat, GScalar, GArray<T>, GOpaque classes;
- Documented GFrame and its host-side counterpart MediaFrame;
- Added some more notes to the data type classes.

2) Give @brief descriptions to most of the cv::gapi::* namespaces

3) Make some symbols private
- These structures are mainly internal and shouldn't be used directly

G-API: Removing ParseSSD overload.

* Removed specialization.

* Removed united

G-API: Add standalone fix for graph empty input

* Add sandalone fix for graph empty input

* Apply some review comments

* Fix whitespace

* Apply review comment: make Mat check more deeper

* Apply some comments

* Remove tracer apply exception throwing

* Apply comments: move validatio into gproto_priv.hpp

* Apply minor text correction

* Fix alignment, remove try-catch

G-API: Improvement stereo documentation.

* Documentation improvement

* Set valid default values for gapi stereo

* Small doc fix

* Review response

* Review response

* Review response

* Review response

* Revie response

* Review response

* Review response

* Review response

G-API: Documentation for Params (IE and ONNX).

* Applying comments

* Removed type of model from PramsDesc

* Added message for onnx ParamDesc

* Whitespaces

* Review

* Fix comments to review

* Fix comments
Co-authored-by: NAnatoliy Talamanov <anatoliy.talamanov@intel.com>

[G-API] Generic type documentation

* Put doc about generic type

* Fix comments to review

G-API: Extend MediaFrame to be able to extract additional info besides access

* Extend MediaFrame to be able to extract additional info besides access

* Add default implementation for blobParams()

* Add comment on the default blobParams()

G-API: Python. Wrapper for networks.

* Python networks

* Added pyopencv_to

* Changed work with pyopencv_to

G-API: Add transpose operation

* Add kernels decl & def

* Add draft for UT

* Fix UT for Transpose

* Add perf test

* Fix docs

* Apply comments

* Support queue capacity as graph compilation argument

* Fix comments to review

* Fix comments to review

* Fix comments to review

G-API: New python operations API

* Reimplement test using decorators

* Custom python operation API

* Remove wip status

* python: support Python code in bindings (through loader only)

* cleanup, skip tests for Python 2.x (not supported)

* python 2.x can't skip unittest modules

* Clean up

* Clean up

* Fix segfault python3.9
Co-authored-by: NAlexander Alekhin <alexander.a.alekhin@gmail.com>

G-API MTCNN sample

* add face detection demo

* clean up

* enable back accumulate

* additional input

* meta args workaround

* additional arg

* add init

* roll back

* fix shadowing

* roll back

* clean up and PNet copy from debug branch which now works

* try nets operator

* more clean up

* more clean up

* add 6 layers pyramid experimental code

* final clean up and ready for PR

* original image resize

* Remove Pnet declarations. Generic infer is used now.

* scales and sizes calculation added

* fix assert, and add ceil to size calculation

* try doubles for scales

* Address comments from Dmitry.

* use half scale option

* fix half scale

* clean up debug outputs

* try to get input image width and height

* clean up

* trailing spaces and review from Maxim

* more comments from Maxim are addressed

* try to fix warnings

* try to fix warnings and address more comments from Dmitry

* crop fix and clean up

* more warnings fixes

* more warnings fixes

* more comments from Maxim are addressed

* even more consts

* copy_n for regressions

* address more comments from Dmitry

* more comments from Maxim

[G-API] Fix bug of GArray<GArray> passing through a graph

* Add test to check GArray<GArray> passing through a graph (assertion failed)

* G-API: Flatten GArray<T> to std::vector<T> when capturing VCtr

- Also: Fix formatting in garray.hpp

* Refactored test, added valuable check

* Initialize size_t
Co-authored-by: NDmitry Matveev <dmitry.matveev@intel.com>

[G-API] Introduce custom python operator API

* Introduce custom python operator API

* Add wip namespace

[G-API] Python ROI generic inference

* Python generic infer overloads

* Move wrappers to appropriate file

[G-API] Support generic infer overloads

* Overloads for generic infer

* Fix build

* Refactoring

* Fix docs

* Put extra stuff to detail namespace

* Add doc for usings

* Remove uneccessary template in Priv

[G-API]: Adding reshape for CNN input.

* Added CNN input IE reshape

* rbs

* Added unordered_set instead vector

* Alignment

G-API: Extend GKernelPackage and serialization API

* Extend GKernelPackage API

* Adding tests

* Extend serialization API

* Address review comments

[G-API] Introduce cv.gin/cv.descr_of for python

* Implement cv.gin/cv.descr_of

* Fix macos build

* Fix gcomputation tests

* Add test

* Add using to a void exceeded length for windows build

* Add using to a void exceeded length for windows build

* Fix comments to review

* Fix comments to review

* Update from latest master

* Avoid graph compilation to obtain in/out info

* Fix indentation

* Fix comments to review

* Avoid using default in switches

* Post output meta for giebackend

[G-API] Support multiple asynchronous requests

* Support nireq option

* Disable tests to check CI

* Fix bug with hanging

* WA to green CI

* Snapshot

* Simplify RequestPool

* Add default values to id

* Fix win warning

Render Frame NV12 on CPU

* render frame on CPU

* doxygen fix

* address review from Alexey

* comment fixes

* Address comments from Ruslan

* remove NV12 specific

* mat clone and more renaming

* misprint fix