Hi,
We looked into it but it's not that simple. The best would be to use the video HTML tag to display the video, but it requires providing the video in two different formats so that it works across all browsers plus a thumbnail. So for the merchant it's quite a burden. I was hpoing we could just have him upload the file, but then the video would have to be converted, which requires special PHP libraries not everyone might have, and similar issue would be there for automatically generating a thumbnail form the video.
Another alternative would be going through youtube, but then you're dependent on youtube, which would be problematic for some countries where youtube is blocked and you've less flexibility.
Basically, so far, I didn't find THE solution that would allow us to do that in a reasonably easy manner while making it easy for the merchants setting up the shop too.