cap = cv2.VideoCapture("sample.avi")
subtractor = cv2.bgsegm.createBackgroundSubtractorMOG()
while True:
	# 画像を取得
  ret, frame = cap.read()
  if not ret:
    break
	detect_mask = subtractor.apply(frame, learningRate=0)
	#差分表示
	cv2.imshow("detect_mask", detect_mask)
cap.release()
cv2.destroyAllWindows()