Swift : AVPlayer don't work

I'm a trying sample and don't work. I just add my url and paste the code. I'm not getting error. Simulator is working, but i see empty page.

Code :

var f=CGRectMake(0, 0, 500, 500)
var url=NSURL(string: "https://www.youtube.com/watch?v=YqeW9_5kURI&spfreload=10")
var playerItem = AVPlayerItem(URL: url)

var v = UIView(frame:f)
var player=AVPlayer(playerItem: playerItem)
var playerLayer=AVPlayerLayer(player: player)

playerLayer.frame=f
v.layer.addSublayer(playerLayer)
player.play()

I'm using viewcontroller. I saw avkit player viewcontroller in object library. Should i use that viewcontroller ? What can i do ?