public Builder addTrackInfo(
        com.google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo value) {
      if (trackInfoBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureTrackInfoIsMutable();
        trackInfo_.add(value);
        onChanged();
      } else {
        trackInfoBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
Track related information. All the tracks that are live at this timestamp.
It only exists if tracking is enabled.
</pre>

<code>
repeated .google.cloud.visionai.v1.OccupancyCountingPredictionResult.TrackInfo track_info = 4;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java