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import cv2
import numpy as np
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cap = cv2.VideoCapture(0)
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while(True):
#capture frame by frame
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame', gray)
if cv2.waitKey(1) &0xFF == ord('q'):
break
cap.release();
cv2.destroyAllWindows()
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