VideoStreaming10.swift

func expandVideo()  {
    player?.pause()
    let controller = AVPlayerViewController()
    controller.player = player
    NotificationCenter.default.addObserver(self, selector: #selector(avPlayerClosed), name: Notification.Name("avPlayerDidDismiss"), object: nil)
    self.parentViewController()?.present(controller, animated: true) { in
        DispatchQueue.main.async {
            player?.play()
        }
    }
}

@objc func avPlayerClosed(_ notification: Notification) {
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.5) { in
        player?.play()
    }
}