This seems like it should be very simple, but I can't find any explanation of how to do it. I tried these and neither worked:
cv2.setWindowProperty("display",cv.WND_PROP_FULLSCREEN, cv.WINDOW_FULLSCREEN)
cv2.setWindowProperty("display",cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
I just keep getting this error message: AttributeError: 'module' object has no attribute 'WND_PROP_FULLSCREEN'