I wouldn't think your video would be that difficult to cast or make. You are creating an illusion with a camera, which has no sense of smell. I would first concoct substitutes for all of the disgusting things I could think of. Once I had the ingredients, I'd tell my potential model what she was really being pelted with and explain that her challenge would be to make it appear truly disgusting.
No one but the crew would ever know that the substances were not at all offensive, and were not what they appeared to be.
Aren't there already many similar videos out there?
The mud-bondage guy