title: MediaCapture change camera focus(WP8.1 and WinRt8.1)
body: <p>I use MediaCapture like this</p>
  
  <pre><code>MediaCapture _capture = new MediaCapture();
  await _capture.InitializeAsync();
  await _capture.StartPreviewAsync();
  </code></pre>
  
  <p>and camera work. But I need to change camera focus from code. Did you know how to do this?</p>