 interface {  // Performs asynchronous video annotation. Progress and results can be  // retrieved through the `google.longrunning.Operations` interface.  // `Operation.metadata` contains `AnnotateVideoProgress` (progress).  // `Operation.response` contains `AnnotateVideoResponse` (results).  AnnotateVideo(ctx context.Context, in *AnnotateVideoRequest, opts ...grpc.CallOption) (*longrunning.Operation, error) 