You asked
Is the canon rf 16mm f 2 8 stm good for video?
Yes, it's a sensible pick for video, with one caveat. On full frame it's a 16mm prime, which sits right in the wide range I suggest for vlogging: around 16-20mm full-frame equivalent at arm's length. It has autofocus, but the lens isn't stabilised, so for handheld work you'll be relying on the camera body.
Pair it with a full frame body. On APS-C it frames like 26mm, which is tighter than you want when you're holding the camera at arm's length. Good full frame options from the catalogue include the Canon EOS RP and the Canon EOS R8.
Whatever you choose, don't skip sound. Plan for a microphone from the start, because bad audio ruins more videos than soft focus does.
Written by Claude from this site's pages.