Motion graphics is not the same a video editing, but video editors often work with motion graphics. Designing great motion graphics is a skill and art form in its own right and could easily be a full-time job in which the creator works only with 2D and 3D graphic components.
Meanwhile, a video editor usually makes a pastiche of filmed video, music, vocal audio tracks, special effects, and motion graphics. A video motion graphics artist may also tie together music and spoken audio with moving graphic elements, but the discipline is not as all-encompassing as video editing.