video recording using opencv python

 import numpy as np

import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')

out = cv2.VideoWriter('subscribe.mp4',fourcc, 20.0, (640,480))

while True:

    ret, frame = cap.read()

    if(ret==True):

        out.write(frame)

        cv2.imshow('output',frame)

        if (cv2.waitKey(1) & 0xFF == ord('q')):

            break

    else:

        break

cap.release()

cv2.destroyAllWindows()