You asked
Is the sirui sniper 75mm f 1 2 good for video?
Honestly, the site doesn't rate this lens for video, so I can't give you a verdict. What I can tell you is that the Sirui Sniper 75mm f/1.2 has autofocus, but no stabilisation, and it frames like about 112mm full frame on APS-C. That's a tight telephoto, so it suits interviews, portraits, and subjects you can film from a distance on a tripod or gimbal. Handheld, the lack of stabilisation will show.
If you mainly vlog, my video guide's vlogging section explains why a wider lens is the usual choice. Sound matters too, so read the audio section before you spend on glass.
Written by Claude from this site's pages.