You can't actually have a video that plays WITHIN the listing page. But a link that opens another page and plays it there is OK, as long as you follow the rules. (Only certain sites can be used to host the video, I use YouTube and would guess most sellers do) Here's an example:
Keep in mind -- many people are sneaking a quick look at eBay while at work.
You don't want anything that would not be work related playing loudly where the boss or that snoop Elaine knowing what you are doing instead of working.
So, a savvy buyer at work would know to mute his audio before clicking the link.....but merely opening up the ebay listing does NOT start the audio playing.
