set video element size/rotate/scale/skew

set video element size/rotate/scale/skew
var webrtc = new WebRTC({
                url: 'http://localhost:8888',
                log: true,
                // the id/element dom element that will hold "our" video
                localVideoEl: {id:'localVideo', width:150, height:150, scale:{x:-1,y:1},skew:{x:45,y:0},rotate:90},
                // the id/element dom element that will hold remote videos
                remoteVideosEl: {id: 'remotes', width:150, height:150, scale:{x:-1,y:1},skew:{x:45,y:0},rotate:90},
                // immediately ask for camera access
                autoRequestMedia: true
            });