title: Swift: save video from NSURL to user camera roll
body: <p>I have a variable <code>videoURL</code> of type NSURL.</p>
  
  <p>If I call <code>println(videoURL)</code> it would return something like this:
  <code>http://files.parsetfss.com/d540f71f-video.mp4</code></p>
  
  <p>I have a button set up that should take this videoURL and save the video to the user's camera roll.</p>
  
  <p>The best I have done is this: </p>
  
  <pre><code>UISaveVideoAtPathToSavedPhotosAlbum(videoPath: String!, completionTarget: AnyObject!, completionSelector: Selector, contextInfo: UnsafeMutablePointer&lt;Void&gt;)
  </code></pre>
  
  <p>While I'm not even sure if this will work or not, I can't figure out how to convert <code>videoFile:NSURL</code> into a <code>videoPath</code>.</p>
  
  <p>Any help is appreciated on this.</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>The following is unsuccessful:</p>
  
  <pre><code>UISaveVideoAtPathToSavedPhotosAlbum(videoURL.relativePath, self, nil, nil)
  </code></pre>