You asked
Is the canon ef 24 70mm f 2 8l usm good for video?
The site doesn't review this lens for video, so I can't tell you it's good or bad for it. What the page does give: it's a fast f/2.8 zoom with autofocus, and it isn't stabilised. That means handheld footage will depend on your camera's own stabilisation or a gimbal.
Its framing is also a poor fit for vlogging. On a full-frame body it covers 24-70mm, and on APS-C it covers roughly 38-112mm. My video guide suggests a wide lens of around 16-20mm full-frame equivalent for talking to the camera at arm's length, so this one only works for that if you're standing well back.
If you're shooting video with a camera that fits this lens, check that the body has a flip screen, a microphone input, and good stabilisation. You can compare options in the lenses guide.
Written by Claude from this site's pages.