For Fallout 4 you should be able to play the game at 1080p and medium settings with decent performance; ~ 40 FPS on average. But some settings should be not enabled like "GodRays". Also, there are areas where FPS will definitely drop below 40 FPS like some indoor locations and Diamond City.
GTA 5 will likely also be playable at 1080p with medium settings. COD:BO2 should be the easiest of the three games to play since it does not seem to have high system requirements. I never played either of these games.