I'd suggest doing some serious research on shooting video with a DSLR first. The main reason these "stills" cameras have become so popular in the "film" world is because of the sensor size, beautiful image quality & availability of so many lenses. What you don't hear so much about is ALL the workarounds needed to accomplish that feat.
You'll also need to invest in: proper stabilization (to avoid jittery images), fluid tripod-head (to help with rolling shutter), an optical/ electronic viewfinder (you need to focus manually off the LCD screen), tons of memory cards (they fill up REALLY FAST at 1080p), batteries (they die fast while on live view), external mic (so you don't hear every little touch of the camera), ND filters (to get the shutter speed down to the proper setting)...
And that is just the bare essential. Then to take it to the next level:
Rod & Rail system, follow-focus unit, gears, matte-box, external audio recorder, more support rigs, and then all the post production needs...
It gets expensive.