@java.lang.Override
    @java.lang.SuppressWarnings("unchecked")
    public io.grpc.stub.StreamObserver<Req> invoke(
        io.grpc.stub.StreamObserver<Resp> responseObserver) {
      switch (methodId) {
        default:
          throw new AssertionError();
      }
    }
<pre>
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).
</pre>
java-video-intelligence/grpc-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/VideoIntelligenceServiceGrpc.java