Look at the source code for this page to see how it's done. Some things you can use:

ytplayer.loadVideoById(id, startSeconds);
ytplayer.cueVideoById(id, startSeconds);
ytplayer.playVideo();
ytplayer.pauseVideo();
ytplayer.stopVideo();
ytplayer.getState();
ytplayer.seekTo(seconds, true);
ytplayer.getVideoBytesLoaded();
ytplayer.getVideoBytesTotal();
ytplayer.getCurrentTime();
ytplayer.getDuration();
ytplayer.getVideoStartBytes();
ytplayer.mute();
ytplayer.unMute();
ytplayer.getVideoEmbedCode()
ytplayer.getVideoUrl();
ytplayer.setVolume(newVolume);
ytplayer.getVolume();
ytplayer.clearVideo();