17 U.S.C. §103(2). "[T]he copyright in a derivative work is independent of, and does not affect or enlarge the scope, duration, ownership, or subsistence of, any copyright protection in the preexisting material.”
but a thing to note about 17 U.S.C. §103(2) is that this only pertains to the part of the derivative work that was made (or added on). So if you use someone's music in your video, the music itself is still owned by the other party, so 17 U.S.C. §103(2) does not apply to said video as a whole. Thus 17 U.S.C. §106(2) states it is up to the original owner to give out licenses to use the work ( which is what i believe
shark_inna_hat was focusing on). As I have said, Bethesda owns the 3D model, and any images they made using it (such as promo art/video), but if a player took a screenshot, the entirety of the image belongs to the player because no part of the image reuses any other images that belong to anyone else. 3D model to 2D image voids any copyright claim (unless one whats to file for defamation if they don't like how the image is being used, and that is a hard case to make) because as 17 U.S.C. §103(2) states, "a derivative work ... does not ... enlarge the scope ... [of] ownership ... in the preexisting material." That means Bethesda can not claim ownership of any screenshots of their game (unless they themselves made the screenshot).