I've never heard of the term before, the Google keyword tool says less than 10 people search for "vod cast" and 210 search for "vodcast" per month, it's a low competition term with no ads for it, based solely on that, I'll say it's worth little to nothing as a domain only.
Might be worth something if you were to develop it, but there would be many better domains available to register and develop, rather than this one, it's not something I would waste time developing.
I've looked at the .com, .net, .de etc and they're all parked pages, the .org is just a very basic personal site, the .info is another basic developed photography site, rather than anything to do with video or vod casts.