@java.lang.Override
  public com.google.cloud.videointelligence.v1p2beta1.NormalizedBoundingBox
      getNormalizedBoundingBox() {
    return normalizedBoundingBox_ == null
        ? com.google.cloud.videointelligence.v1p2beta1.NormalizedBoundingBox.getDefaultInstance()
        : normalizedBoundingBox_;
  }
<pre>
The normalized bounding box location of this object track for the frame.
</pre>

<code>
.google.cloud.videointelligence.v1p2beta1.NormalizedBoundingBox normalized_bounding_box = 1;
</code>

@return The normalizedBoundingBox.
java-video-intelligence/proto-google-cloud-video-intelligence-v1p2beta1/src/main/java/com/google/cloud/videointelligence/v1p2beta1/ObjectTrackingFrame.java