If it's a standalone game or a mod on Steam you just replace the existing version of video_services.dll with this, and start up videos should just work. If you mean for sourcemods, it is possible too by reassigning the engine's version of video services when a game shader is loaded through a pointer hack.
If it's a standalone game or a mod on Steam you just replace the existing version of video_services.dll with this, and start up videos should just work. If you mean for sourcemods, it is possible too by reassigning the engine's version of video services when a game shader is loaded through a pointer hack.