This isn't meant to be a "yes" or "no" answer, only a concern.
My fear about videos as answers is that videos are not index-able. When a video becomes a substitute for a well-written answer, that answer no longer provides a point of entry for people searching for that information. Every visual cue that supplants an equivalent piece of text is that much less content that can be searched on the site.
Videos are, essentially, a black box to the Internet — they break many of the major mechanisms that make the Internet work. It's a growing problem that will have to be solved someday but we're not there, yet. There's simply no way to visualize and find "where's that exercise where I saw that guy do that thing with his leg?"
Text is the primary means of communicating what we have here to the outside world. For every answer that is done "in video," that information becomes obscured behind a black curtain; One less opportunity for people to find the text that describes the solution.