This kind of thing is exactly what VC is designed for.
The issue is more to do with hardware. Obviously, some kind of automated lighting is needed, whether it's a Hue light or a Belkin Wemo, or Z-wave lights with a Vera controller, or X-10 lights, etc.
You mention Eventghost in your subject line, but it's not clear why. VoxCommando can communicate directly with a variety of home automation devices, so Eventghost *may* be necessary, or not.
The details of how such a VC command would be built will depend on specifics of your hardware, and the conditions under which you want this scenario (i.e., every time a "play movie" XBMC command is issued, or only in certain circumstances).