You asked
Is the canon ef 35mm f 1 4l usm good for video?
I don't have a video verdict for the Canon EF 35mm f/1.4L USM, so I can't call it good or bad for video. Its page lists autofocus, but no image stabilisation, and f/1.4 gives very shallow depth of field. That's lovely for interviews and talking heads, but it's harder to keep sharp when you or the camera are moving.
On full frame it frames as a standard 35mm. On APS-C bodies such as the Canon EOS 80D, it becomes roughly 56mm equivalent, a tighter view that suits interviews better than vlogging. For vlogs, the video guide recommends a wider lens, around 16-20mm full-frame equivalent. Whatever lens you pick, budget for sound too, as the audio section explains.
Written by Claude from this site's pages.