title: pinch zoom in android camera
body: <p>How do I implement pinch zoom in android camera. </p>
  
  <p>There are several tutorials to pinch zoom an image, but I could not find one for zooming camera.</p>
  
  <p>Using the default  displays a control with + and - during camera preview. but this is not what I am looking for. In most of camera applications, you can pinch on the camera preview using two fingers and zoom by moving away your fingers.</p>