Created BuildOpenCV4OpenVINO (markdown)

BuildOpenCV4OpenVINO.md

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+# Build OpenCV for OpenVINO
+
+OpenVINO does not provide custom OpenCV drop since 2022.1.1 release.
+If OpenVINO user needs OpenCV functionality there are 2 approaches how to get it:
+1. Get OpenCV from another sources (system repositories, pip, conda, homebrew). It is easy to follow this approach, however it has several disadvantages:
+   * OpenCV version is out-of-date  
+   * OpenCV does not contain G-API module (e.g. some OMZ demos use G-API functionality)
+   * OpenCV does not use available CPU instructions since it has build to cover wide range of hardware
+   * OpenCV does not support Intel TBB, Intel Media SDK
+   * OpenCV DNN module can not use OpenVINO as computational backend
+2. Compile OpenCV from source code. This approach solves the issues mentioned above.
+
+The instruction below shows how to build OpenCV for OpenVINO.
+
+## Ubuntu
+
+1. Install OpenVINO according to the [instruction](https://docs.openvino.ai/latest/openvino_docs_install_guides_installing_openvino_linux.html)
+2. Copy OpenCV repository:
+> git clone --recurse-submodules https://github.com/opencv/opencv.git
+3. Install the following packages:
+> sudo apt-get install \\\
+build-essential \\\
+cmake \\\
+ninja-build \\\
+libgtk-3-dev \\\
+libpng-dev \\\
+libjpeg-dev \\\
+libwebp-dev \\\
+libtiff5-dev \\\
+libopenexr-dev \\\
+libopenblas-dev \\\
+libx11-dev \\\
+libavutil-dev \\\
+libavcodec-dev \\\
+libavformat-dev \\\
+libswscale-dev \\\
+libavresample-devlibavutil-dev \\\
+libavcodec-dev \\\
+libavformat-dev \\\
+libswscale-dev \\\
+libavresample-dev \\\
+ffmpeg-dev \\\
+libtbb2 \\\
+libssl-dev \\\
+libva-dev \\\
+libmfx-dev \\\
+libgstreamer1.0-dev \\\
+libgstreamer-plugins-base1.0-dev 
+4. Create build directory and enter into it:
+> mkdir ~/build-opencv && cd ~/build-opencv
+5. Compile OpenCV:
+> cmake -G Ninja \\\
+-D BUILD_INFO_SKIP_EXTRA_MODULES=ON \\\
+-D BUILD_EXAMPLES=OFF \\\
+-D BUILD_JASPER=OFF \\\
+-D BUILD_JAVA=OFF \\\
+-D BUILD_JPEG=ON \\\
+-D BUILD_APPS_LIST=version \\\
+-D BUILD_opencv_apps=ON \\\
+-D BUILD_opencv_java=OFF \\\
+-D BUILD_OPENEXR=OFF \\\
+-D BUILD_PNG=ON \\\
+-D BUILD_TBB=OFF \\\
+-D BUILD_WEBP=OFF \\\
+-D BUILD_ZLIB=ON \\\
+-D WITH_1394=OFF \\\
+-D WITH_CUDA=OFF \\\
+-D WITH_EIGEN=OFF \\\
+-D WITH_GPHOTO2=OFF \\\
+-D WITH_GSTREAMER=ON \\\
+-D OPENCV_GAPI_GSTREAMER=OFF \\\
+-D WITH_GTK_2_X=OFF \\\
+-D WITH_IPP=ON \\\
+-D WITH_JASPER=OFF \\\
+-D WITH_LAPACK=OFF \\\
+-D WITH_MATLAB=OFF \\\
+-D WITH_MFX=ON \\\
+-D WITH_OPENCLAMDBLAS=OFF \\\
+-D WITH_OPENCLAMDFFT=OFF \\\
+-D WITH_OPENEXR=OFF \\\
+-D WITH_OPENJPEG=OFF \\\
+-D WITH_QUIRC=OFF \\\
+-D WITH_TBB=OFF \\\
+-D WITH_TIFF=OFF \\\
+-D WITH_VTK=OFF \\\
+-D WITH_WEBP=OFF \\\
+-D CMAKE_USE_RELATIVE_PATHS=ON \\\
+-D CMAKE_SKIP_INSTALL_RPATH=ON \\\
+-D ENABLE_BUILD_HARDENING=ON \\\
+-D ENABLE_CONFIG_VERIFICATION=ON \\\
+-D ENABLE_PRECOMPILED_HEADERS=OFF \\\
+-D ENABLE_CXX11=ON \\\
+-D INSTALL_PDB=ON \\\
+-D INSTALL_TESTS=ON \\\
+-D INSTALL_C_EXAMPLES=ON \\\
+-D INSTALL_PYTHON_EXAMPLES=ON \\\
+-D CMAKE_INSTALL_PREFIX=install \\\
+-D OPENCV_SKIP_PKGCONFIG_GENERATION=ON \\\
+-D OPENCV_SKIP_PYTHON_LOADER=OFF \\\
+-D OPENCV_SKIP_CMAKE_ROOT_CONFIG=ON \\\
+-D OPENCV_GENERATE_SETUPVARS=OFF \\\
+-D OPENCV_BIN_INSTALL_PATH=bin \\\
+-D OPENCV_INCLUDE_INSTALL_PATH=include \\\
+-D OPENCV_LIB_INSTALL_PATH=lib \\\
+-D OPENCV_CONFIG_INSTALL_PATH=cmake \\\
+-D OPENCV_3P_LIB_INSTALL_PATH=3rdparty \\\
+-D OPENCV_SAMPLES_SRC_INSTALL_PATH=samples \\\
+-D OPENCV_DOC_INSTALL_PATH=doc \\\
+-D OPENCV_OTHER_INSTALL_PATH=etc \\\
+-D OPENCV_LICENSES_INSTALL_PATH=etc/licenses \\\
+-D OPENCV_INSTALL_FFMPEG_DOWNLOAD_SCRIPT=ON \\\
+-D BUILD_opencv_world=OFF \\\
+-D BUILD_opencv_python2=OFF \\\
+-D BUILD_opencv_python3=ON \\\
+-D PYTHON3_PACKAGES_PATH=install/python/python3 \\\
+-D PYTHON3_LIMITED_API=ON \\\
+-D HIGHGUI_PLUGIN_LIST=all \\\
+-D OPENCV_PYTHON_INSTALL_PATH=python \\\
+-D CPU_BASELINE=SSE2 \\\
+-D OPENCV_IPP_GAUSSIAN_BLUR=ON \\\
+-D WITH_INF_ENGINE=ON \\\
+-D InferenceEngine_DIR=<OpenVINO_ROOT_DIRECTORY>/runtime/cmake/ \\\
+-D ngraph_DIR=<OpenVINO_ROOT_DIRECTORY>/runtime/cmake/ \\\
+-D INF_ENGINE_RELEASE=2022010000 \\\
+-D VIDEOIO_PLUGIN_LIST=ffmpeg,gstreamer,mfx \\\
+-D CMAKE_EXE_LINKER_FLAGS=-Wl,--allow-shlib-undefined \\\
+-D CMAKE_BUILD_TYPE=Release <OpenCV_ROOT_REPO_DIRECTORY> && \\\
+ninja
+
+OpenCV package is available at ~/build-opencv directory. 
+To compile application that uses OpenCV, the following environment variables should be specified:
+> export OpenCV_DIR="\~/build-opencv/cmake" \
+> export LD_LIBRARY_PATH="\~/build-opencv/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" \
+> export PYTHONPATH="~/build-opencv/python_loader${PYTHONPATH:+:$PYTHONPATH}"
+
+