@java.lang.Override
  public int getTracksCount() {
    return tracks_.size();
  }
<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