Hi @graysonlevi, the videos that you have seen are demonstrating eye tracking a player eye movement during a game via Tobii Ghost which in fact can support any game. This is not the same as using the Tobii 4C for *control* during gaming which unfortunately is not something currently supported with Call of Duty: Modern Warfare.
Feel free to download and checkout Tobii Ghost @ https://gaming.tobii.com/software/ghost/
Please do let us know if we can provide any further information. Best Wishes.