I don’t think the “insects crawling up the body” part would be simple in pIllusion, although it might be possible depending on the details of the shot. Having the bugs already covering the body is possible, but it will still require a lot of work, and some masking work in your compositing app.
Although if you want it to look like the bugs are crawling around the person (crawls from their front, around their sides, to the other side) it won’t look right in pIllusion — you’ll want to use a 3D app for that.
Even if you do use pIllusion, you’ll need an animated image sequence of a bug crawling.
Alan.
wondertouch