interesting for me that's really jumpy, it looks like each frame is 120px high? so something like this is much smoother at the beginning for me:

    var step = function() { $("#container").css({top: (parseInt($("#container").css("top"))-115)+'px'}); window.webkitRequestAnimationFrame(step); }; step();

 but in the middle where it zooms into the people in the car, it get's out of sync...