You just click the iso button on top and change it with the ribbed clicky wheel on top, just try to keep it @ 800 & below when you start going up you will start to see noise but try different iso settings then watch them on your screen., set it @ 1920 x 1080 24, then set the shutter to 50 will say next to the fstop at the bottom left, and make sure when you click menu, to set movie exposure to manual or your going to be going all over the place , and then lastly dont let it really set the awb, but do that manually when you shoot that way its consistent color wise. = that covers your film look.
this is basically the "i wish i read this before; all in a paragraph when i picked up a dslr"