We Just finished working with a client, Bulk Connection, Inc., to add content sensitive video overlay to web pages. We put together the web site, but the videos were inserted as a simple overlay after the fact.
Check it out at http://www.bulkconnection.com/Services_Liquid_Video.htm. Another example can be seen at http://www.whatsinyourcity.net/. The technology is a standard scripted video shot against a green screen and then overlaid onto your web page. You can do your own script or you can use an actor. It is very cool technology with a lot of possibilities.
The company that makes all this possible is OnSite Video, http://www.onsitevideos.com/ located in Boston.
