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Why is the null type expected error occurs if VideoCapture('vtest.avi') is replaced by VideoCapture(0) in BackgroundSubtractorMOG2 tutorial?

import numpy as np import cv2

cap = cv2.VideoCapture(0)

fgbg = cv2.createBackgroundSubtractorMOG2()

while(1): ret, frame = cap.read()

fgmask = fgbg.apply(frame)

cv2.imshow('frame',fgmask)
k = cv2.waitKey(30) & 0xff
if k == 27:
    break

cap.release() cv2.destroyAllWindows()

Why is the null type expected error occurs if VideoCapture('vtest.avi') is replaced by VideoCapture(0) in BackgroundSubtractorMOG2 tutorial?

import numpy as np import cv2cv2 cap = cv2.VideoCapture(0)cv2.VideoCapture(0) fgbg = cv2.createBackgroundSubtractorMOG2()cv2.createBackgroundSubtractorMOG2() while(1): ret, frame = cap.read()cap.read() fgmask = fgbg.apply(frame) cv2.imshow('frame',fgmask) k = cv2.waitKey(30) & 0xff if k == 27: break cap.release() cv2.destroyAllWindows() cap.release() cv2.destroyAllWindows()