The video cameras this lens was designed for has 3 CCD chips, while a DSLR has a single sensor. These chips on a video camera are all slightly different distances from the lens - so the lens focuses the colors at different planes. Using your video zoom on a DSLR would cause severe chromatic abberation. So the answer is no, you can't use this lens with your DSLR.
Even if you managed to physically adapt the lens to fit the camera, the image circle the lens produces would never cover the sensor of a 7D or especially a 5D. It would give you a tiny circle of an image with a large black vignette all around. And, even if it DID cover, it'd look very poor. That lens is optimized for three 2/3" CCDs, not one large CMOS sensor. Would it work for a newer HD ENG camera? Most likely, but not on a Canon DSLR.
I've seem some B4 lenses adapted to the Panasonic GH1 DSLR, but it has a smaller sensor than the 7D and it also has a shorter flange focal distance which allows just about any lens to "fit" with enough esoteric adapters. And, I'm pretty sure they're using a 2x focal extender switched on to make those lenses cover without vignetting, which I don't think your lens has.