title: Swift code error on setSampleBufferDelegate
body: <p>I am getting an error in the second line, I could not solve it at all.</p>
  
  <pre><code>videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL)
  videoDataOutput.setSampleBufferDelegate(self, queue: videoDataOutputQueue)
  </code></pre>
  
  <blockquote>
    <p>Error: cannot invoke 'setSampleBufferDelegate' with an argument list
    of type '(ViewController, queue: dispatch_queue_t)'</p>
  </blockquote>