There is video support, however it is not implemented on the versions we have had previous. I havent tried it on the latest BT Beta firmware yet, as its a big hassle to get the code into a moddable form.
We are waiting for a final release, before attempting to do anything with it.
On the older versions if you enable media sharing, then search in the strings.xml in the content folder for
<!-- video is not supported yet but here's how you would enable it... -->
<string id="UPnP.MenuContainer.8" value="All Videos (beta)|*|8|Play home videos stored on your PC." />
and uncomment the line as i have done above, it will show video thumbnails, howerver the play functionallity is not implemented yet (not sure in the beta versions).
Mick