public CameraInstance ModifyCameraInstance(string mediaServerId, ReqMoidfyCameraInstance req)
        {
            ResponseStruct rs;
            var            ret = MediaServerApis.ModifyCameraInstance(mediaServerId, req, out rs);

            if (rs.Code != ErrorNumber.None)
            {
                throw new HttpResponseException(JsonHelper.ToJson(rs));
            }

            return(ret);
        }