text: import cv2
  """
  OpenCV从摄像头采集视频/或从多媒体文件中读取视频帧:
      VideoCapure()
      cap.read()
      cap.release()
  """
  cv2.namedWindow('video', cv2.WINDOW_NORMAL)
  cv2.resizeWindow('video', 640, 480)
  #获取视频设备
  cap = cv2.VideoCapture(0)
  #从多媒体文件中读取视频帧
  # cap = cv2.VideoCapture(r'C:\Users\10991\Desktop\尹磊相册\yinzihao\yinzihao.mp4')
  
  while cap.isOpened():
      #从摄像头读取视频帧
      ret, frame = cap.read()
      cv2.imshow('video', frame)
      key = cv2.waitKey(1)
      if key & 0xFF == ord('q'):
          cap.release()
          cv2.destroyAllWindows()
          break
  
  