import numpy as np
import cv2

cap = cv2.VideoCapture (0)

while (True):
	ret, frame = cap.read ()
	gray = cv2.cvtColor (frame, cv2.COLOR_BGR2GRAY)

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

cap.release ()
cv2.destroyAllWindows ()