FBX's Game capture mode captures the image directly from the game's processes. If you are not seeing the filters applied in your recorded videos, I would guess that those filters are being applied after FBX has already captured the image. If that's the case, the only way to capture the image with the filters applied would be to use Fullscreen capture mode instead, which will capture the image that is sent to the screen rather than the original image created by the game.
