Opencv CUDA with PyQT

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Hi,

I am looking for some help here. I am building an application with Python OpenCV 4.2 with CUDA enabled on a windows machine. PyQT is being used for the UI. The GPU download part to render in QLabel is slow, I learned that there is a way you can map the gpumat directly to QOpenGLWidget, so that there is no CPU download. But I am lost at that part, has anyone done that in Python and be able to share a sample code?