We have produced a small video showing how to get a white background in your video’s.
We used a 2 head Supersoftbox kit to light the background and a combination of another 2 head Supersoftbox kit or a single head Lightbank softbox kit. We had a background support with white cotton muslin backdrop
You need to have more light coming from the background than is coming from your subject this effectively overexposes the background while keeping your subject properly exposed. Wether your shooting with a DV Cam or DSLR you need to override the settings otherwise automatic settings will try to make the background grey.