Canon Rebel t3i/EOS 600D help? Filming?

I've just bought a new camera ^ as you see. And I've only owned Nikons before, no Canons but I was wondering, since I make youtube videos, and I understood that this camera should have a thing that makes the camera focus on its own, or a motor you know in it (that for example the Nikon D5100 doesn't have) so how do I get it to focus on its on? This is really important for me to know. Like when I'm filming avideo so it focuses on me and then for example if I lift my finger up it would focus on that.

Stop being lazy, and read the instructions that came with your camera.

Information you should've asked prior to purchasing this camera. It doesn't do anything like that. It's has manual and auto settings. That's it. And both you must push a button to use.