If you are shooting a subject who's back is to direct sunlight, and you want the subject to retain detail, then typically, you would simply set your exposure for the front of the subject. Of course, in doing so, the sunlight will probably "blow out" (be extremely bright): if its a cloudless day then am sure the sun would be 6 or 7 stops over the front of the subject. If you want the front of the subject and the backlit sun to be closer in terms of exposure, then you either have to add light to the front of the subject (using bounced light, reflector or white board, or artificial light) or cut the amount of sun light falling on the back of the subject (using a net, silk, or some form of diffusion). This will bring the amount of light behind the subject and the amount of light hitting the front of the subject closer together in terms of footcandles (amount of light).
Don't worry about wether its a still photo or a moving image, the principles of lighting will still stay the same. You should, however, be aware of wether or not you are using film or digital/video.
If you are using film, you will have much more latitude (the amount of detail from shadow to highlights) then if you use a digital camera.
Read up on Ansel Adams "Zone System" of photography and a lot of your questions will be answered. Hope this helps.
Raffi Kondy