code: def update(self):
      # keep looping infinitely until the thread is stopped
      while True:
          # if the thread indicator variable is set, stop the thread
          if self.stopped:
              return
  
          # otherwise, read the next frame from the stream
          (self.grabbed, self.frame) = self.stream.read()
  
file_path: imutils/imutils/video/webcamvideostream.py
imports: from threading import Thread
  import cv2
label_desc: Use image node_id 3 for calling the WebcamVideoStream obj's underlying member method code with example usage: obj.update() without return types