You asked
Is the sony a1 good for video?
The a1 page only covers its basics: a 50.1-megapixel full frame mirrorless body from 2021, with in-body stabilisation. It doesn't say anything about its video features, so I can't judge how good it is for video from here. Before you decide, check the screen, microphone input and weight against the vlogging checklist.
If you do use the a1 for vlogging, the lens matters most. A wide lens around 16-20mm full frame works best, and these from its list are a sensible start:
Plan for sound from the start, as the audio notes explain. My honest view is that if video is your main goal, a smaller body is likely the better buy than an a1.
Written by Claude from this site's pages.