autofocus

I use my iPhone and a HD webcam right now for our videos. I could use Air Miles to get the Canon, and I'm wondering if it is worth it. I'm a bit confused about autofocus. Does it actually autofocus while filming? We don't shoot a vlog, but I'd love to have a higher quality camera. What do you...

I'd love to upgrade my camera. Any suggestions for a DSLR that is under 500 that does 1080p with autofocus? Thanks!