You can use your phone, laptop webcam, etc. You don't need a fancy setup.
I use a camera like this (can't remember the exact model offhand) :
I don't use the auto focus because it keeps trying to focus and gets annoying. I just turn that off so I can gesture or move without it out-thinking itself.
I don't use the built in mic. I use a Samson Go Mic.
Both are plugged into my laptop.
The camera has its own recording software. It's dead simple to use. For editing, if I wish to which I almost never do, I use Camtasia. I think it can be pricey but I got it in a special charity sale bundled with other things at a ridiculously cheap price.
I don't care to research every detail for you as I feel like I've literally answered this same question on here, possibly even for you, but figure 70 for camera plus 50 for that mic to start. There's so many ways to do this. You don't likely have to spend much. Some people have super nice studios. It's not necessary unless you're trying to monetize and be super professional.