There are several brands of video name tags available, and most seem to work in pretty much the same way. Upload a video or slideshow via USB, attach the video player to your shirt (or wear it with a lanyard) and play. The players come with a rechargeable battery with a life of six to ten hours, depending on the device and how it is used.
It seems that the video could be a distraction in a routine sales situation, but a video-playing name tag would certainly get attention at your next networking event. If nothing else, it would be a great conversation starter.
If you want to use it to show products or other content, the players I looked at allow you to call up more than one video stored in memory, or scroll through a slide show to locate the slide you want. That would be cool at trade shows.
One of the players has a belt buckle frame available, but asking customers to stare at your, uh, belt…well, that just seems wrong.
Several video name tags are available at prices ranging from $129 to $149 at Amazon.com.