title: UIImpactFeedbackGenerator Not Working When Audio Device Added to AVCaptureSession
body: <p>Adding microphone audio input to <code>AVCaptureSession</code> seems to disable <code>UIImpactFeedbackGenerator</code>.</p>
  <pre><code>let audioDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeAudio)
  let audioDeviceInput = try AVCaptureDeviceInput(device: audioDevice)
  if self.session.canAddInput(audioDeviceInput) {
     self.session.addInput(audioDeviceInput)
  }
  </code></pre>
  <p>Once the audio device is removed, feedback resumes.</p>
  <p>Is this normal behavior? Is there a way around this?</p>
  <p>I notice the stock iOS Camera app in video mode and long-pressing on thumbnail seem to still make the feedback work. So, there has to be a way around this?</p>