I don't really often like those Unreal 4 videos because it's jarring seeing those cartoony characters with these realistic environments. Not to mention a lot of these mappers overdo flashy visual effects. (The bloom and the heat waves are WAY overdone.) Meanwhile the quality of Link's model is really, really bad, and drifts into uncanny valley territory.
I will say this though, the L-targeting and other gameplay adaptations being dropped into the engine? That was good attention to detail. Usually these mappers just do rudimentary work but the animations still look like a generic PC demo with floaty physics and choppy animation.
EDIT: Just so I'm clear I'm not trying to be overly negative or anything. It's cool seeing your favorite childhood games in a high-end visually impressive engine. I'm just saying this demo, along with a lot of similar demos, are just really half-done. It's a trend I see a lot of. And as a disclaimer, I've seen this video a couple of times before and honestly this is still one of the most well-done out of the lot.