So ive downloaded obs. But the only thing i get is no sound and a black screen.
Since I uninstalled it I will show you a picture from internet
First start the game you want to record, in our case Warband. Dont close it! Press alt+tab. Click in the "Sources" box, then "Add", then "Game capture". Name it like you want, for example M&B Warband. In "Aplication" select the game you want to record. Click OK and voilá! You can start recording. Just make sure the box next to "M&B Warband" is always ticked if you want to record it. But dont forget to change settings from Stream to recording etc.