title: UIImagePicker and AVCaptureSession access camera simultaneously
body: <p>I'm wondering if it's possible to have an instance of an <code>AVCaptureSession</code> and <code>UIImagePicker</code> both accessing the camera simultaneously.</p>
  
  <p>I want to create an app that shows an ambient light meter/indicator as an overlay view of a <code>UIImagePicker</code> when the camera is active. I previously implemented this using <code>UIGetScreenImage()</code>, but Apple is now disallowing use of this private API in favor of <code>AVCaptureSession</code>. In my experimentation, <code>AVCaptureSession</code> seems to become suspended when <code>UIImagePicker</code> displays the camera view. Any ideas? Thanks!</p>