You asked
Is the leica vario elmarit sl 28 70mm f 2 8 asph good for video?
Yes, it can work well for video, with one caveat. The 28-70mm f/2.8 has autofocus and a constant f/2.8 aperture, so your exposure stays steady as you zoom, which matters when you're shooting footage. It isn't stabilised, though, so you'll want a camera with good in-body stabilisation or a steady rig.
It's a reasonable pick for general video and interviews. For vlogging, where you need a wider view at arm's length, our video guide suggests around 16-20mm full-frame equivalent, so 28mm will feel tight. If you need a wider view, the Leica Vario-Elmarit-SL 24-70mm starts wider.
It fits these cameras, and these are the ones I'd look at for video:
Written by Claude from this site's pages.