partial void OnCopy(VideoServiceSettings existing);
 partial void OnConstruction(VideoService.VideoServiceClient grpcClient, VideoServiceSettings effectiveSettings, gaxgrpc::ClientHelper clientHelper);
 private VideoServiceSettings(VideoServiceSettings existing) : base(existing)
 {
     gax::GaxPreconditions.CheckNotNull(existing, nameof(existing));
     GetVideoSettings = existing.GetVideoSettings;
     OnCopy(existing);
 }