cv2.videocapture.read() does not return a numpy array

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Reading (cam.read()) from a VideoCapture returns a tuple (return value, image). With the first item you check wether the reading was successful, and if it was then you proceed to use the returned image.

This is documented at https://opencv-tutorial.readthedocs.io/en/latest/intro/intro.html#capture-live-video

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