public Builder setFaceTrack(com.google.cloud.videointelligence.v1p3beta1.Track value) {
      if (faceTrackBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        faceTrack_ = value;
      } else {
        faceTrackBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
A track of a person's face.
</pre>

<code>.google.cloud.videointelligence.v1p3beta1.Track face_track = 3;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/CelebrityTrack.java