sudo apt update
sudo apt upgrade

sudo apt install build-essential cmake pkg-config unzip yasm git checkinstall
sudo apt install libjpeg-dev libpng-dev libtiff-dev
sudo apt install libavcodec-dev libavformat-dev libswscale-dev libavresample-dev
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
sudo apt install libxvidcore-dev x264 libx264-dev libfaac-dev libmp3lame-dev libtheora-dev 
sudo apt install libfaac-dev libmp3lame-dev libvorbis-dev
sudo apt install libopencore-amrnb-dev libopencore-amrwb-dev
sudo apt-get install libdc1394-22 libdc1394-22-dev libxine2-dev libv4l-dev v4l-utils
cd /usr/include/linux
sudo ln -s -f ../libv4l1-videodev.h videodev.h
cd ~

sudo apt-get install libgtk-3-dev
sudo apt-get install python3-dev python3-pip
sudo -H pip3 install -U pip numpy

sudo apt install python3-testresources
sudo apt-get install libtbb-dev
sudo apt-get install libatlas-base-dev gfortran
sudo apt-get install libprotobuf-dev protobuf-compiler
sudo apt-get install libgoogle-glog-dev libgflags-dev
sudo apt-get install libgphoto2-dev libeigen3-dev libhdf5-dev doxygen

cd ~
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.2.0.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.2.0.zip
unzip opencv.zip
unzip opencv_contrib.zip

echo "Create a virtual environment for the python binding module"
sudo pip install virtualenv virtualenvwrapper
sudo rm -rf ~/.cache/pip
echo "Edit ~/.bashrc"
export WORKON_HOME=$HOME/.virtualenvs
export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
source /usr/local/bin/virtualenvwrapper.sh
mkvirtualenv cv -p python3
pip install numpy

echo "Procced with the installation"
cd opencv-4.2.0
mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=RELEASE \
	  -D CMAKE_C_COMPILER=/usr/bin/gcc-8 \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=OFF \
    -D WITH_TBB=ON \
    -D WITH_CUDA=ON \
    -D BUILD_opencv_cudacodec=OFF \
    -D ENABLE_FAST_MATH=1 \
    -D CUDA_FAST_MATH=1 \
    -D WITH_CUBLAS=1 \
    -D WITH_V4L=ON \
    -D WITH_QT=OFF \
    -D WITH_OPENGL=ON \
    -D WITH_GSTREAMER=ON \
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D OPENCV_PC_FILE_NAME=opencv.pc \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D OPENCV_PYTHON3_INSTALL_PATH=~/.virtualenvs/cv/lib/python3.8/site-packages \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-4.2.0/modules \
    -D PYTHON_EXECUTABLE=~/.virtualenvs/cv/bin/python \
    -D BUILD_EXAMPLES=ON \
    -D WITH_CUDNN=ON \
    -D OPENCV_DNN_CUDA=ON \
    -D CUDNN_LIBRARY=/usr/local/cuda/lib64/libcudnn.so.7.6.5 \
    -D CUDNN_INCLUDE_DIR=/usr/local/cuda/include  \
    -D CUDA_ARCH_BIN=7.5 ..

nproc
make -j8
sudo make install

sudo /bin/bash -c 'echo "/usr/local/lib" >> /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig

# For Each Environment
sudo cp -r ~/.virtualenvs/cv/lib/python3.8/site-packages/cv2 /usr/local/lib/python3.8/dist-packages
echo "Modify config-3.8.py to point to the target directory" 
sudo nano /usr/local/lib/python3.8/dist-packages/cv2/config-3.8.py 
``` 
	    PYTHON_EXTENSIONS_PATHS = [
	    os.path.join('/usr/local/lib/python3.8/dist-packages/cv2', 'python-3.8')
	    ] + PYTHON_EXTENSIONS_PATHS
```