Creating a Mod to add VR support to ABZU


I want to add VR support to an unreal engine 4 game (specifically ABZU).
Adding a VR Camera should be easy, I won’t need much code and no new assets.
Unfortunately I don’t have much experience with Unreal Engine and all the modding tutorials I can find are for games that have a modding sdk.
Is it possible to write mods for games that don’t have a sdk?

Thanks in advance