For video focus, I like Canon's dual pixel cmos sensor. It tracks subjects better than Sony or Nikon for videos. You have to be really careful buying Nikon for videos, many of their cheaper cameras only use contrast detection which is aweful for tracking subjects. Sony mirrorless all use pdaf pixels and do a decent job for video focus, but only their higher end cameras do an exceptional job.
Canon has the EOS RP which is a mirrorless FULL FRAME camera. To use canon's older EF/EF-S lenses, you have to use an adapter which is another $100, but you can buy a nifty fifty used for like $50. That's puts you at $1150 which is over your budget, however the benefits of full frame in photography are worth it. You get much better low light performance and sliver thin focus area for that fantastic blurred backround portraits known as bokeh.
The EOS RP is a mirrorless camera, if you'll be shooting sports you'll want a traditional mirrored camera. But for people photography, landscapes and artistic photography, I'd buy mirrorless.
With any camera you buy, I'd recommend buying a 50mm(full frame) or 30mm-ish(APS-C) prime lens. This lens FOV coverage is about equivalent to your naked human eye and is great for walkabout photography. It provides a much lower aperture number which can give you very narrow depth of field which gives you that subject isolation and great bokeh look.
If you want a smaller camera, I'd get a sony mirrorless. I love mine.