It'd be interesting to see how people have done this. In Jive 6, we had to customise the Video module to work with Brightcove instead of Twistage (for uploading new videos), as well as allowing our content guys to paste in a Brightcove URL and have that transformed into an embedded video.
I will also be following this - we are just now starting to use Brightcove and talking about how to best embed videos into Jive.
Ideally, we would like to empower employees to be able to upload their own videos into Brightcove, but like Tracy mentioned, I don't understand how we would set the permission levels and train employees. Or if this is even something we would want to do.
Right now, employees are creating and paying for their own Vimeo accounts, so there isn't one Corporate system to maintain internal videos.