&gt; If &quot;insight&quot; means &quot;tracking&quot;, this sounds very user-friendly.<p>What about a slideshow which has a video of the speaker, and changes the slides for particular timestamps.<p>At the moment you&#x27;ll have to detect the playback event and just hope that the video is playing back at the &quot;correct&quot; speed, and change the slides based on a JavaScript clock.<p>While that works most of the time, it isn&#x27;t what I&#x27;d describe as reliable.<p>Alternatives exist, like making the slides part of the video too, but now text cannot be copied out, links cannot be clicked, and so on...