video_html5_events.js

document.getElementById('video-cnt').addEventListener('ended',myHandler,false);
            document.getElementById('video-cnt').addEventListener('play',Start,false);
            function myHandler(e) {
                that.sendGa("Button-Custom_TVC_Video_Ended-Clicked");
                console.log('ended');
                // What you want to do after the event
            }

            function Start(){
                // What you want to do after the event
            }