Swift! Present AVPlayerViewController with PreRoll video in a SKScene

Question

I want to present a AVPlayerViewController with a pre-roll ad. This is what I have so far:

At the top:

let preRollAdPlayer = AVPlayerViewController()
let url = NSURL(fileURLWithPath: "https://www.youtube.com/watch?v=cIG1MsR7zWs")

in my didMoveToView:

let player = AVPlayer(URL: url)
preRollAdPlayer.showsPlaybackControls = true
preRollAdPlayer.player = player
if #available(iOS 9.0, *) {
    preRollAdPlayer.delegate = self
}

When a SKSpriteNode is touched:

self.view?.window?.rootViewController?.presentViewController(preRollAdPlayer, animated: true, completion: {

    self.preRollAdPlayer.playPrerollAdWithCompletionHandler({ (error) -> Void in

        if (error != nil) {
            NSLog("Error Message: %@", error)
        }
    })
    print("preRoll loaded")    
})

but when i present this AVPlayerViewController it just looks like this:

What am I doing wrong here?