OpenCV Error: (-215)size.width>0 && size.height>0 in function imshow

by

This error message

error: (-215)size.width>0 && size.height>0 in function imshow

simply means that imshow() is not getting video frame from input-device.
You can try using 

cap = cv2.VideoCapture(1)

instead of 

cap = cv2.VideoCapture(0)

& see if the problem still persists.

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