title: Can ARKit (or ARSession) keep running in the background?
body: <p>My question is - Can <code>ARSession</code> run in the background - basically I need the ARKit running and all the per frame information and camera incentrics but I DONT want to render the camera feed on the screen - As happens in the <code>ARSCNView</code>. </p>
  
  <p>Not specifically in the background thread or process.</p>
  
  <p>Basically I just want to use the Tracking information(Images + Camera Pos + Camera Euler Angles etc) from the ARKit and dont want to render anything in AR per se or the camera feed. </p>
  
  <p>Before everyone jumps on me - I know that Apple restricts GPU process in the background - case in point :</p>
  
  <blockquote>
    <p>Execution of the command buffer was aborted due to an error during
    execution. Insufficient Permission (to submit GPU work from
    background) (IOAF code 6)</p>
  </blockquote>
  
  <p>But there should be a way to use the <code>ARKit</code> or <code>ARSession</code> without the camera feed and only with the tracking information, right?</p>