title: setFrame not working properly for AVCaptureVideoPreviewLayer
body: <p>I am trying to add a AVCaptureVideoPreviewLayer into my view like this</p>
  
  <pre><code>[captureVideoPreviewLayer setFrame:CGRectMake(10.0f,10.0f,300.0f,300.0f)];
  [self.view.layer addSublayer:captureVideoPreviewLayer];
  </code></pre>
  
  <p>but it doesnt seem to follow the CGRectMake, the layer is 300 in height but not in width, I am not sure why!</p>