How to use ad impression event with videojs_5 vast-vpaid plugin
<p>How can i track ad impression using videojs vast-vpaid plugin?
Ad impression will always be fired when the ad started?
Is there a way to track ads duration events? (first-quartile,second,etc)
Will it be different tracking event for VPAID ads?</p>

<p>This is an example of my code:
    
    
    
        
        
        
        
        
        </p>

<pre><code>&lt;/head&gt;
&lt;body&gt;
&lt;video id="example_video_1" class="video-js vjs-default-skin"
       controls="" preload="none" width="300" height="300"
       poster="http://vjs.zencdn.net/v/oceans.png"&gt;
&lt;/video&gt;
&lt;script&gt;
    var player;
    $(document).ready(function() {
        player = videojs('example_video_1', {
            techOrder: ['html5','flash'],
            //autoplay: true,
            sources: [{
                type: "video/mp4",
                src: "http://vjs.zencdn.net/v/oceans.mp4"
            }],
            plugins: {
                vastClient: {
                    adTagUrl: "http://ssp.lkqd.net/ad?pid=2000&amp;sid=20497&amp;env=3&amp;format=1&amp;width=[WIDTH]&amp;height=[HEIGHT]&amp;dnt=[DO_NOT_TRACK]&amp;output=vast&amp;rnd=[CACHEBUSTER]&amp;pageurl=[URL_ENCODED_PAGEURL]",
                    adsCancelTimeout: 3000,
                    adsEnabled: true
                }
            }
        });

        player.on('vast.adStart', function () {
        });

        player.on('vast.contentEnd', function () {
        });

    });
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>