You asked
Is the leica super vario elmarit sl 14 24mm f 2 8 asph good for video?
The site doesn't test this lens for video, so I can't tell you how it performs when filming. What I can say is what the spec sheet covers. It's an autofocus zoom with no stabilisation, so you'd want a stabilised camera body or a gimbal for handheld work.
Its 14-24mm range is wide enough for the kind of shot the video guide recommends for vlogging, about 16-20mm full-frame equivalent at arm's length. On APS-C it frames like 21-36mm, which is less wide for that job.
If you're filming, I'd put the money toward a microphone first. The audio section explains why. You can see the cameras that take this lens on its catalogue page.
Written by Claude from this site's pages.