I think realtime interaction is the key element missing from most early-stage screenings, not video. I'd rather have an IM/irc/voice chat with someone, propose problems, and observe how he tries to solve the problem, than canned and rehearsed video clips. The only job for which I'd consider a canned video clip to be really useful is a job which requires producing canned video clips.
I don't think anything is stopping you from using IM/irc/chat. The problem that video screenings solve isn't one that you face.
For example, Thunderbird School of Global Management, a top international MBA program, is planning on using Active Interview as part of their admissions process. They're letting applicants answer a video questionnaire to replace 1 of 3 essays. It's purely optional. They have a full admission team of 10+ people, working full time traveling around the world screening applicants. Using a tool like AI saves tons of time and money in the early screening stages. Unless you are a organization like that, you won't truly feel the pain that Active Interview or Hirehive solves.
