You asked
Is the panasonic leica dg 100 400mm f 4 6 3 ii good for video?
The site doesn't review this lens for video, so I can't give you a verdict on it. What the lens page does say is that it's a stabilised zoom with autofocus, and that its aperture narrows from f/4 to f/6.3 as you zoom in. Those are useful starting points, but they don't tell you how it performs when filming.
If you're shooting video, the Video page explains that the features that matter for filming aren't the ones on the front of the box. It's worth reading before you buy. The lens fits several Panasonic bodies in the GH line, including the Panasonic Lumix GH6, so check those camera pages for video details. You can also see the full lens listing at Panasonic Leica DG 100-400mm f/4-6.3 II.
Written by Claude from this site's pages.