Play items from MPMediaItemCollection in AVPlayer [Swift]

Here is the thing, I have a MPMediaItemCollection with user choosen items(from the library). I used the mediaPicker to do that. Now, I need to get the URL from these items so I can play them on a AVPlayer. This is the best I can find, but when I "translate" to swift it gets messed up. If someone can help me I would appreciate a lot.

Here is your swift code:

func mediaPicker(mediaPicker: MPMediaPickerController!, didPickMediaItems mediaItemCollection: MPMediaItemCollection!) {

    for thisItem in mediaItemCollection.items as! [MPMediaItem] {
        let itemUrl = thisItem.valueForProperty(MPMediaItemPropertyAssetURL) as? NSURL
        self.dismissViewControllerAnimated(true, completion: nil)

        // Play the item using MPMusicPlayer
        var appMusicPlayer = MPMusicPlayerController.applicationMusicPlayer()
        appMusicPlayer.play()

        // Play the item using AVPlayer
        let playerItem = AVPlayerItem(URL: itemUrl)
        let player = AVPlayer(playerItem: playerItem)
        player.play()
    }
}