是否可以将HiLens Kit摄像头拍摄的画面或者技能运行结果录成视频保存下来？

可以，请使用OpenCV的VideoWriter，注意录制的视频格式必须是MJPG，参考代码如下：

  camera = hilens.VideoCapture() 

  fps = 20 
  size = (1280, 720) 
  format = cv2.VideoWriter_fourcc('M','J','P','G') 
  writer = cv2.VideoWriter("output.avi", format, fps, size) 

  count = 0 
  duration = 100 # 录制的视频时长
  while True: 
      input_nv21 = camera.read()

      input_bgr = cv2.cvtColor(input_nv21, cv2.COLOR_YUV2BGR_NV21) 
      writer.write(input_bgr)

      if count >= fps * duration: 
          break
      count += 1 
  writer.release()