You can easily embed a video preview to your products using the theme’s custom video shortcodes. No plugins needed. You can embed self-hosted videos /audio or use one of the supported sites which include: Vimeo, YouTube, Google Video, Blip TV, Veoh, Viddler, Revver.
(More upon request)
You can optionally select to display product images along with the video. These will appear in their own tab as you see here.
[vimeo id="5315673" width="355" height="200"]