import numpy as np
import cv2

cap = cv2.VideoCapture('example.avi')

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret is True:
        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    else∏
        break

    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()