Person detector from MediaPipe Pose (#179)

* Person detector from MediaPipe Pose

* review 2

* cols cols is not cols rows

* Update CMakeLists.txt

---------
Co-authored-by: NYuantao Feng <yuantao.feng@opencv.org.cn>

models/person_detection_mediapipe/CMakeLists.txt

+cmake_minimum_required(VERSION 3.24.0)
+set(project_name "opencv_zoo_person_detection_mediapipe")
+
+PROJECT (${project_name})
+
+set(OPENCV_VERSION "4.7.0")
+set(OPENCV_INSTALLATION_PATH "" CACHE PATH "Where to look for OpenCV installation")
+find_package(OpenCV ${OPENCV_VERSION} REQUIRED HINTS ${OPENCV_INSTALLATION_PATH})
+# Find OpenCV, you may need to set OpenCV_DIR variable
+# to the absolute path to the directory containing OpenCVConfig.cmake file
+# via the command line or GUI
+
+file(GLOB SourceFile
+    "demo.cpp")
+# If the package has been found, several variables will
+# be set, you can find the full list with descriptions
+# in the OpenCVConfig.cmake file.
+# Print some message showing some of them
+message(STATUS "OpenCV library status:")
+message(STATUS "    config: ${OpenCV_DIR}")
+message(STATUS "    version: ${OpenCV_VERSION}")
+message(STATUS "    libraries: ${OpenCV_LIBS}")
+message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
+
+# Declare the executable target built from your sources
+add_executable(${project_name} ${SourceFile})
+
+# Link your application with OpenCV libraries
+target_link_libraries(${project_name} PRIVATE ${OpenCV_LIBS})

models/person_detection_mediapipe/README.md

@@ -9,6 +9,8 @@ SSD Anchors are generated from [GenMediaPipePalmDectionSSDAnchors](https://githu
 
 ## Demo
 
+### Python
+
 Run the following commands to try the demo:
 
 ```bash
@@ -21,6 +23,23 @@ python demo.py -i /path/to/image -v
 python demo.py --help
 ```
 
+### C++
+
+Install latest OpenCV and CMake >= 3.24.0 to get started with:
+
+```shell
+# A typical and default installation path of OpenCV is /usr/local
+cmake -B build -D OPENCV_INSTALLATION_PATH=/path/to/opencv/installation .
+cmake --build build
+
+# detect on camera input
+./build/opencv_zoo_person_detection_mediapipe
+# detect on an image
+./build/opencv_zoo_person_detection_mediapipe -m=/path/to/model -i=/path/to/image -v
+# get help messages
+./build/opencv_zoo_person_detection_mediapipe -h
+```
+
 ### Example outputs
 
 ![webcam demo](./example_outputs/mppersondet_demo.webp)