public Builder addFaceAnnotations(
        int index,
        com.google.cloud.videointelligence.v1beta2.FaceAnnotation.Builder builderForValue) {
      if (faceAnnotationsBuilder_ == null) {
        ensureFaceAnnotationsIsMutable();
        faceAnnotations_.add(index, builderForValue.build());
        onChanged();
      } else {
        faceAnnotationsBuilder_.addMessage(index, builderForValue.build());
      }
      return this;
    }
<pre>
Face annotations. There is exactly one element for each unique face.
</pre>

<code>repeated .google.cloud.videointelligence.v1beta2.FaceAnnotation face_annotations = 5;
</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1beta2/src/main/java/com/google/cloud/videointelligence/v1beta2/VideoAnnotationResults.java