If you're on Xbox One World at War (via backwards compatibility) has a co-op mode for campaign. Black Ops 3 also has a co-op campaign as well. Both of them have split-screen and online.
Yes, you can play co-op campaign mode offline in some games. For example, Call of Duty: Black Ops III and Call of Duty: WWII have split-screen co-op mode, where you can play with a friend on the same console offline. However, some games only support online co-op, like Call of Duty: Modern Warfare 2 and Call of Duty: Ghosts.
The last Call of Duty game to have a co-op campaign was Black Ops 3 back in 2015. Every COD game with a campaign since then has lacked the feature. MW2 (2022) did introduce the Spec Ops mode, which allowed players to take part in large-scale, open-area missions with friends. However, it appears that this mode won’t be returning in MW3 (2023).
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