code: public static Media mediaUploadvideo(String access_token, Uploadvideo uploadvideo) {
          return MediaAPI.mediaUploadvideo(access_token, uploadvideo);
      }
docs: 高级群发 构成 MassMPvideoMessage 对象的前置请求接口
  
  @param access_token access_token
  @param uploadvideo  uploadvideo
  @return Media