xcode 8 || AVPlayer is showing video however it's not playing - ios

Question

I have this simple code to play an online video. After doing the HTTP permission option, it did start to show the video and I can scroll through it, however, it doesn't play at any point. Here is the code. I would appreciate if someone could help me with this.
regards,
A Beginner Coder
import UIKit
import AVKit
import AVFoundation
class ViewController: UIViewController {
var playerViewController = AVPlayerViewController()
var playerView = AVPlayer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(_ animated: Bool) {
let movieUrl: NSURL? = NSURL(string: "http://clips.vorwaerts-gmbh.de/VfE_html5.mp4")
playerView = AVPlayer(url: movieUrl as! URL)
playerViewController.player = playerView
self.present(playerViewController, animated: true){
self.playerViewController.player?.play()
}
}
}

Answer 1

When I ran your code in a sample project the debugger prints:
"App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file."
The two options I found were:
1) Change the scheme to https:// in your URL
or
2) Adjust the App Transport Security settings in your Info.plist
I successfully played the video using both options with your code.

Answer 2

It turns out that the only thing i had done was, the last line had
"self.playerViewController.player?.play()" ----->>> "?" and when i changed it to --------->>> "!"
IT MAGICALLY STARTED WORKING....
i have seen the meme on the internet where they talk about coders not knowing why the code works and why it doesn't... same happpened to me i guess.