public com.google.cloud.videointelligence.v1.TrackOrBuilder getTracksOrBuilder(int index) {
      if (tracksBuilder_ == null) {
        return tracks_.get(index);
      } else {
        return tracksBuilder_.getMessageOrBuilder(index);
      }
    }
<pre>
The face tracks with attributes.
</pre>

<code>repeated .google.cloud.videointelligence.v1.Track tracks = 3;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/FaceDetectionAnnotation.java