title: CIFaceFeature trackingID is always coming same for multiple faces
body: <p>I want to detect multiple faces in my project. Therefore I planned to use the trackingID property of the CIFaceFure to keep the track of the face. But I found that every time it is coming same for every face. </p>
  
  <p>So my problem is that how can I identify a face uniquely when multiple face are there in the video frame. I don't want to recognize the face for later purpose only detection for the current video frame. Thanks.</p>
  
  <p>I am using the same code as in SqaureCam apple sample project. in iOS 6.</p>
  
  <pre><code>for ( CIFaceFeature *face in features ) {
      NSLog(@"face.trackingID %d",face.trackingID);
  }
  </code></pre>
  
  <p>The above code is priting the same ID for every face.</p>