cam = cv2.VideoCapture(1)
cam.set(cv2.CAP_FFMPEG, True)
cam.set(cv2.CAP_PROP_FPS, 30)
while True:
    ret, frame = cam.read()
cv2.imshow('frame', frame)
if cv2.waitKey(1) & 255 == ord('q'):
    break
cam.release()
cv2.destroyAllWindows()
grab frame NTSCtoUSB dongle, opencv2, python wrapper