title: videojs - how to show thumbnails as the progress-slider is moved
body: <p>On YouTube's player, when you hover on progress-bar and traverse your mouse along, you see a series of thumbnails, as well as time-values.  This is great, when you're tying to find a scene that you know of visually, and want its time-value.</p>
  
  <p>Whereas, on videojs player, you see only time-values.</p>
  
  <p>(On X-Finity (Comcast, their fast-forward similarly shows rapid series of thumbnails.  But, googling seems to reveal that Videojs doesn't have fast-forward.  And, I think I'd prefer YouTube's feature over a fast-forward.)</p>
  
  <p>So, bottom-line question is:  How to make Videojs player behave like YouTube's?</p>
  
  <p>(I'm thinking this would be difficult to implement for the end-user, in javascript.  Detecting that the slider is being moved is no doubt straight-forward, but code to display thumbnails would be the part that I have NO IDEA
  how to accomplish.)</p>
  
  <p>Anyone know how to program this?</p>