code: def stop(self):
      if self.cap is not None:
          self.cap.release()
          print("[INFO] Stop webcam")
  
file_path: heart-rate-measurement-camera/webcam.py
imports: import cv2
  import numpy
  import time
label_desc: Use image node_id 4 for calling the Webcam obj's underlying member method code with example usage: obj.stop() without return types