Play full screen video with routers

VideoViewController.swift

//
//  ViewController.swift
//
//  Created by Vasiliy Savchuk on 19.01.17.
//  Copyright © 2017 All rights reserved.
//

import UIKit
import AVFoundation
import AVKit

class VideoViewController: UIViewController {
    
    var avPlayer: AVPlayer!
    var avPlayerLayer: AVPlayerLayer!
    
    var router: AuthorizationRouter!
    
    //MARK - Lifecicle Object
    
    deinit {
        NotificationCenter.default.removeObserver(self,
                                                  name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
                                                  object: avPlayer.currentItem)
    }
    
    override func viewDidLoad() {
        self.setupAVPlayer()
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(playerItemDidReachEnd(notification:)),
                                               name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
                                               object: avPlayer.currentItem)
        avPlayer.play()

    }
    
    //MARK: - Methods
    
    func playerItemDidReachEnd(notification: Notification) {
        let playerVideoItem: AVPlayerItem = notification.object as! AVPlayerItem
        playerVideoItem.seek(to: kCMTimeZero)
    }
    
    func setupAVPlayer() {
        let theURL = Bundle.main.url(forResource: "video", withExtension: "mp4")!
        
        avPlayer = AVPlayer(url: theURL)
        avPlayerLayer = AVPlayerLayer(player: avPlayer)
        avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        avPlayer.volume = 0
        avPlayer.actionAtItemEnd = .pause
        avPlayerLayer.frame = view.layer.bounds
        view.backgroundColor = .clear
        view.layer.insertSublayer(avPlayerLayer, at: 0)
    }
    
    //MARK: - Actions
    
    @IBAction func skipVideoButtonDidPress(_ sender: Any) {
        self.router?.backTo()
    }
}