How to get stream object from kurento utils when using kurento java tutorial samples

Using kurento tutorials java samples. I Want to handle stream events like onended etc on the webrtcpeer object. Following is my sample code from where i want to fetch the stream object.

var options = {
           localVideo: video,
           mediaConstraints: constraints,
           onicecandidate: participant.onIceCandidate.bind(participant)
       };

var peer = new kurentoUtils.WebRtcPeer.WebRtcPeerSendonly(options, function(error) {
           if (error) {
               retu console.error(error);
           }
           this.generateOffer(participant.offerToReceiveVideo.bind(participant));
       });

I want to handle events in a way similar to as mentions in this question

How should I proceed? Please Help