From what I understand (comparing my knowledge of the younger brother and the younger brother's gushing over the older's intellect), the older brother was a real big head. I know people get bored when their intellectual capacity has not met a worthy rival of a problem. I extrapolated.
Do those two areas provide similar technological challenges? Obviously, they're both about coding the backbone of the product, and I understand that visuals are, often, a big part of a game engine, which could translate to visual editing. Is that what you meant?
Yep, exactly. You're shifting your knowledge and skill of computational related programming into another field just to have more of a challenge.
At my own place I've seen engineers internally transfer to take on new challenges. Not surprisingly the trend of this is front-end -> back-end/ops -> video.