title: AVcaptureMetadataOutput does not work in ios10
body: <p>I used the <code>AVCaptureMetadataOutputObjectsDelegate</code> for a barcode scanner and it worked perfect. But since iOS 10 it does not working anymore. I always get a <strong>EXC_BAD_ACCESS</strong> error when I open the <code>barcodescanner</code> with it´s button. The error occurs when I add an output to the session.</p>
  
  <p>Can someone help me please? I really tried everything and it drives me crazy.</p>