public Builder addLandmarks(com.google.cloud.videointelligence.v1.DetectedLandmark value) {
      if (landmarksBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureLandmarksIsMutable();
        landmarks_.add(value);
        onChanged();
      } else {
        landmarksBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
Optional. The detected landmarks.
</pre>

<code>
repeated .google.cloud.videointelligence.v1.DetectedLandmark landmarks = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/TimestampedObject.java