That does not generically 100% solve the problem of "is this person a human". That ties things to an identity, but the verification that an identity is
actually that human is not solved. Stolen identities, forged identities, faked identities, all still problems, and as soon as the full force of the black market capitalist market in such things is turned on that world, it'll still be a big problem.
Also video-based ID checks have a shelf-life measured in single-digit years now, if indeed the plural is even appropriate. The tricks for verifying that you're not looking at real-time faked face replacement won't hold up for much longer.
Don't forget what we're talking about, either. We're talking about accessing Wikimedia over HTTP, not briefing some official on top-secret information. How does "video interviews" solve "a highly distributed network of hacked machines is crawling my website using everyone's local identity"?