var playerInstance = jwplayer("myElement")
playerInstance.setup({
    playlist: [{
        file: "/assets/sintel.mp4",
        image: "/assets/sintel.jpg",
        tracks: [{ 
            file: "/assets/captions-en.vtt", 
            label: "English",
            kind: "captions",
            "default": true 
        },{ 
            file: "/assets/captions-fr.vtt", 
            kind: "captions",
            label: "French"
        }]
    }]
});