code: def start(self):
          
          # open device
          openni2.initialize(PrimesenseSensor.OPENNI2_PATH)
          self._device = openni2.Device.open_any()
  
          # open depth stream
          self._depth_stream = self._device.create_depth_stream()
          self._depth_stream.configure_mode(PrimesenseSensor.DEPTH_IM_WIDTH,
                                            PrimesenseSensor.DEPTH_IM_HEIGHT,
                                            PrimesenseSensor.FPS,
                                            openni2.PIXEL_FORMAT_DEPTH_1_MM) 
          self._depth_stream.start()
  
          # open color stream
          self._color_stream = self._device.create_color_stream()
          self._color_stream.configure_mode(PrimesenseSensor.COLOR_IM_WIDTH,
                                            PrimesenseSensor.COLOR_IM_HEIGHT,
                                            PrimesenseSensor.FPS,
                                            openni2.PIXEL_FORMAT_RGB888) 
          self._color_stream.camera.set_auto_white_balance(self._auto_white_balance)
          self._color_stream.camera.set_auto_exposure(self._auto_exposure)
          self._color_stream.start()
  
          # configure device
          if self._registration_mode == PrimesenseRegistrationMode.DEPTH_TO_COLOR:
              self._device.set_image_registration_mode(openni2.IMAGE_REGISTRATION_DEPTH_TO_COLOR)
          else:
              self._device.set_image_registration_mode(openni2.IMAGE_REGISTRATION_OFF)
  
          self._device.set_depth_color_sync_enabled(self._enable_depth_color_sync)
  
          self._running = True
docs: Start the sensor