ortc-1.js

navigator.MediaDevices.getUserMedia ({
    "audio": true, 
    "video": {
        width: 640,
        height: 360,
        facingMode: "user"
    }
}).then(
    gotStream
).catch(
    gotMediaError
);

function gotStream(stream) {
    var mediaStreamLocal = stream;
    …
}

I recommend using https://gist.github.com/gasp/7128144af5d139aced6d instead

Where the whole script?