You asked
Is the tamron sp 70 200mm f 2 8 di vc usd good for video?
The site doesn't have video tests for this lens, so I can't give you a verdict on its footage. Going by the specs listed on its catalogue page, it's stabilised, has a constant f/2.8 aperture, and is a telephoto zoom. That suits interviews, sports, or anything you film from a distance.
It isn't a vlogging lens. The video guide recommends a wide lens for talking to camera, and 70-200mm is far from that. It's also a heavy lens to hold at arm's length.
If you want to film people from across a room, this could work well on a full-frame body from the list. For vlogging, look at the guide's wide-lens advice instead.
Written by Claude from this site's pages.