class ViewController: UIViewController {

    let url = URL(string:"https://video.twimg.com/ext_tw_video/768701846240104449/pu/vid/720x1280/FW9MWNMhhdKfdygm.mp4")!

    var playerViewController: KKPlayerViewController!

    // viewDidLoad() is an example.
    override func viewDidLoad() {

        super.viewDidLoad()

        // 1.
        self.playerViewController = KKPlayerViewController()

        // 2.
        self.addChildViewController(self.playerViewController)
        self.playerViewController.view.frame = self.view.bounds
        self.view.addSubview(self.playerViewController.view)
        self.playerViewController.didMove(toParentViewController: self)

        // 3.
        self.playerViewController.delegate = self

        // 4.
        self.playerViewController.load(url: url)
    }
}

extension ViewController: KKPlayerViewControllerDelegate {
    func playerViewController(_ playerViewController: KKPlayerViewController, didChangePlayerStatus status: PlayerStatus) {

    }

    func playerViewController(_ playerViewController: KKPlayerViewController, didChangePlaybackStatus status: PlaybackStatus) {

    }

    func playerViewControllerDidReadyForDisplay(_ playerViewController: KKPlayerViewController) {
        // 5.
        playerViewController.play()
    }
}