Easily get the url of a YouTube video's different thumbnails

YoutubeThumbnail.swift

/**
What size and quailty youtube thumbnail you want.

- Zero:     Player Background: (480x360 pixels) (same as High)
- One:      Start: (120x90 pixels)
- Two:      Middle: (120x90 pixels)
- Three:    End: (120x90 pixels)
- Default:  Normal: (120x90 pixels)
- Medium:   Medium: (320x180 pixels)
- High:     High: (480x360 pixels) (same as 0)
- Standard: SD: (640x480 pixels) (HQ videos only)
- Max:      HD: (1920x1080 pixels) (HQ videos only)
*/
enum ThumbnailQuailty : String {
	case Zero = "0.jpg"
	case One = "1.jpg"
	case Two = "2.jpg"
	case Three = "3.jpg"
	
	case Default = "default.jpg"
	case Medium = "mqdefault.jpg"
	case High = "hqdefault.jpg"
	case Standard = "sddefault.jpg"
	case Max = "maxresdefault.jpg"
	
	/// All values sorted by image size (1,2,3 are the same size)
	static let allValues = [Default, One, Two, Three,  Medium, High, Zero, Standard, High]
}

func thumbnailURLString(videoID:String, quailty: ThumbnailQuailty = .Default) -> String {
	//return "http://img.youtube.com/vi/\(videoID)/\(quailty.rawValue)"
	return "http://i1.ytimg.com/vi/\(videoID)/\(quailty.rawValue)"
}

Based on all the answers to this question: http://stackoverflow.com/questions/2068344/how-do-i-get-a-youtube-video-thumbnail-from-the-youtube-api

Can you please tell me how can I add the video ID in this function. Can you show me an exact example where u use a real youtube video.

Cheers,
Ilir