Just screen captures. I played it using Tabletop Simulator and some guy's rendering of Battlefleet Gothic ships.
Really easy to do. Tabletop Simulator works really well for smaller THW titles. I even play Nuts on it from time to time.
It takes a bit of patience to grab scenery and such from the steam workshop, but once you do, you can have smoking ruins, fully rendered tanks and all sorts of good stuff.