code: def start(self):
          
          self._cap = cv2.VideoCapture(self._device_id + cv2.CAP_V4L2)
          if not self._cap.isOpened():
              self._running = False
              self._cap.release()
              self._cap = None
              return False
  
          self._cap.set(cv2.CAP_PROP_FRAME_WIDTH, self._camera_intr.width)
          self._cap.set(cv2.CAP_PROP_FRAME_HEIGHT, self._camera_intr.height)
          self._running = True
  
          # Capture 5 frames to flush webcam sensor
          for _ in range(5):
              _ = self.frames()
  
          return True
docs: Start the sensor.