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    session.createStream({
        name: streamName,
        display: localVideo,
        constraints: constraints
    }).on(STREAM_STATUS.PUBLISHING, function(publishStream){
        ...
        setStatus(STREAM_STATUS.PUBLISHING);
        //play preview
        session.createStream({
            name: streamName,
            display: remoteVideo
        }).on(STREAM_STATUS.PLAYING, function(previewStream){
            document.getElementById(previewStream.id()).addEventListener('resize', function(event){
                resizeVideo(event.target);
            });
            //enable stop button
            onStarted(publishStream, previewStream);
        }).on(STREAM_STATUS.STOPPED, function(){
            publishStream.stop();
        }).on(STREAM_STATUS.FAILED, function(stream){
            //preview failed, stop publishStream
            if (publishStream.status() == STREAM_STATUS.PUBLISHING) {
                setStatus(STREAM_STATUS.FAILED, stream);
                publishStream.stop();
            }
        }).play();
    }).on(STREAM_STATUS.UNPUBLISHED, function(){
        ...
    }).on(STREAM_STATUS.FAILED, function(stream){
        ...
    }).publish();