Hide YouTube player controls.

I created a player using the code below and initially I have control set to 1 and

 ytplayer = new YT.Player('ytplayer', {
    height: '400',
    width: '100%',

    playerVars: {
        'autoplay': 0,
        'controls': 1,
        'frameborder': 0,
        'modestbranding': 1,
        'rel': 0,
        'showinfo': 0
    },
    events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange
    }
});

      

        
        
        
      

    

Now I want to hide the control dynamically. so I tried the player.setOption method for that, but I couldn't do it so anyone can help me ??