Install OpenCV with GPU support

OpenCV_GPU.sh

sudo apt-get install qt5-default
sudo apt-get install opencl-headers
sudo pip install pylint
# Install minimal prerequisites (Ubuntu 18.04 as reference)
sudo apt update && sudo apt install -y cmake g++ wget unzip
# Download and unpack sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/master.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/master.zip
unzip opencv.zip
unzip opencv_contrib.zip

# Create build directory and switch into it
mkdir opencv-master/build && cd build

# Note you should chaneg CUDA_ARCH_BIN=7.0 according to your GPU

cmake \
	-D CMAKE_BUILD_TYPE=RELEASE \
	-D CMAKE_INSTALL_PREFIX=/usr/local \
	-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-master/modules/ \
	-D CUDA_CUDA_LIBRARY=/usr/local/cuda-11.0/lib64/stubs/libcuda.so \
	-D CUDA_ARCH_BIN=7.0 \
	-D CUDA_ARCH_PTX="" \
	-D WITH_CUDA=ON \
	-D WITH_TBB=ON \
	-D BUILD_PYTHON_SUPPORT=ON \
	-D BUILD_NEW_PYTHON_SUPPORT=ON \
	-D BUILD_OPENCV_PYTHON3=ON \
	-D PYTHON3_EXECUTABLE=/usr/lib/miniconda3/bin/python3.8 \
	-D PYTHON3_PACKAGES_PATH=/usr/lib/miniconda3/lib/python3.8/site-packages \
	-D WITH_V4L=ON \
	-D INSTALL_C_EXAMPLES=ON \
	-D INSTALL_PYTHON_EXAMPLES=ON \
	-D BUILD_EXAMPLES=ON \
	-D WITH_QT=ON \
	-D WITH_OPENGL=ON \
	-D ENABLE_FAST_MATH=1 \
	-D CUDA_FAST_MATH=1 \
	-D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-11.0 \
   	-D CMAKE_LIBRARY_PATH=/usr/local/cuda-11.0/lib64/stubs \
	-D WITH_CUBLAS=ON \
	-D WITH_NVCUVID=ON \
	-D BUILD_opencv_cudacodec=ON ..
	
cmake --build .

sudo make install

sudo mv /usr/local/include/opencv4/opencv2 /usr/local/include/opencv2
 
cp lib/python3/cv2.cpython-38-x86_64-linux-gnu.so cv2.so
mv cv2.so /usr/lib/miniconda3/lib/python3.8/site-packages