If you plan to use only pre-roll video, example code setup should look like:
<script>var player=videojs('player_1');player.nuevo({//possible nuevo plugin options here});player.vroll({src:"//yourdomain.com/video.mp4",type: "video/mp4",href: "url-to-go-on-preroll-click",offset:0,skip: 5 //optional skip video option.id=1 //optional preroll video ID if you wish to track ad action.});</script>
<script>var player=videojs('player_1');player.nuevo({//possible nuevo plugin options here});player.vroll([{src:"//path-to-preroll_video.mp4",type: "video/mp4",href: "url-to-go-on-preroll-click",offset:0,skip: 5id= "1"},src:"//yourdomain.com/midroll_video.mp4",type: "video/mp4",href: "url-to-go-on-midroll-click",offset:30,skip: 5id: "2"},src:"//yourdomain.com/postroll_video.mp4",type: "video/mp4",href: "url-to-go-on-postroll-click",offset:'100%',skip: 5id: "3"}]);</script>
<script>player.on('vroll', function(event, data) {var ad_id = data.id;var action = data.action;});</script>