For me this looks a bad idea.
Because any Video will not be less than 4-5 minutes and publishers who will pay the parking site to show their video wants this video to be watched by the user.
and any user coming to parked domain will not spend from more than few seconds.
also the videos will not be relevant to the keyword or domain name which in turn make the user not interested to watch the video.
The sort of videos I was thinking of was just like the short ads. you get on Youtube before the actual video you want to watch - so it would just be a short 15 - 30 second clip with a link to click if you want more information - basically something to occupy people's brains while they stare at a page of ads.