Swift 3-AVPlayer-同时播放声音文件和视频

我有一个视频，效果很好

let AVPlayerVC = AVPlayerViewController()

func setupCustomPlayer() {

    AVPlayerVC.view.frame = self.view.frame
    AVPlayerVC.view.sizeToFit()
    AVPlayerVC.showsPlaybackControls = false
    self.view.addSubview(AVPlayerVC.view)

    let videoURL = NSURL(string: "http://videourl")


    let player = AVPlayer(url: videoURL! as URL)
    AVPlayerVC.player = player
    AVPlayerVC.player?.play() 
}

播放视频时，我可以使用AVplayer播放声音文件（mysoundfile.m4p）吗？如果没有，有什么替代方案