DPI:

How many people / roles / time does it take to add media to a live performance work?

Hal Eagar:

A whole lot. Maybe one person can be them all, but it sucks to be that person. It's like shooting a film and building a interactive video installation.
DP, editor, CG, computer specialist, video specialist, rigger, ... I 'd really have to stop abd think for a while.

But I like there to be 2-3 people on the video team at least. With overlap in skills of course but maybe broken down in these areas of expertise and responsibility.
Shooting and editing, install cuing, and stage effects.
And if possible tack on an operator/SM.