[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] Prohibit setPrecision & preprocessing for importedNetworks

* Prohibit preprocessing for imported networks

* Fix typo

input_names -> output_names

* Move setBlob logic to separate function

* Change comment

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] Support postprocessing for not argmaxed outputs

* Support postprocessing for not argmaxed outputs

* Fix typo

* Add assert

* Remove static cast

* CamelCast to snake_case

* Fix windows warning

* Add static_cast to uint8_t

* Add const to variables

[G-API] Support FP16 input precision for IE backend

* Support fp16 input precision IE backend

* Add support to wrapIE

Remove explicit PNet resizes from MTCNN graph

* remove PNet resizes

* address comment from Ruslan

MTCNN 1st pnet simplification to ensure single graph input

* 1st pnet simplification to ensure single graph input

* address comment from Dmitry M regarding unused variable

[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

GAPI: Implement ConstValue serialize/deserialize

* Implement ConstValue ser/deser

* Fix MacOs compile issue

* Fix Docs compile

* Change uint32 -> uint64 for serialize tag

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: ONNX. Skip tests.

* imread for every test

* Changed name for Yolo function

G-API: Python. Desync.

* Desync. GMat.

* Alignment

G-API: Python. Gaze Estimation sample.

* GE pep8

* Added function description, wrapped copy

* Applying review comments

* One more change

* Added gin

* Rstrt bb

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

G-API: Support vaargs for cv.compile_args

* Support cv.compile_args to work with variadic number of inputs

* Disable python2.x G-API

* Move compile_args to gapi pkg

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>

Hot fix negative MTCNN PNet ROI coordinates

* fix negative roi start

* some more experiments

* clean up

[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()

Remove custom transpose kernel from MTCNN sample

G-API: Python. Wrapper for networks.

* Python networks

* Added pyopencv_to

* Changed work with pyopencv_to

Add streaming queue capacity option choice to MTCNN G-API sample

* Add streaming queue capacity option

* trying to fix mac build

* rename face detection sample

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] IE backend convert fp32 to fp16

* Support FP16 in IE backend

G-API MTCNN demo hotfix to align overall pipeline accuracy with the reference Python code output.

* MTCNN G-API demo aligned with Python from OMZ

* clean up

* more comments from Maxim are addressed.

* address comment from Dmitry