There's a crazy machinima some guy made where he took gameplay from Modern Warfare 2 and somehow managed to make it look like it was being shot through a handheld camera, and it looks like it's a movie even though technically it's just a really fancy spectator mode for the single player campaign. Something like this could work very well for bridging the cutscenes in a video game movie edit as "action scenes," however I am not sure whether or not the amount of work that would be involved with making high-quality machinimas like this would be something a fan editor would be willing to put up with, since I imagine a fair bit of mod savvy is involved.
You can see the video below: