Super Mario Bros., I hear, is one of those “classic video games.” To be truthful, I didn’t play it until I was 14 — I grew up a Sonic the Hedgehog kid. Still — it’s a timeless classic that, in no way, shape or form needs to be “updated” for today’s audiences.
With that, behold! A first-person Super Mario Bros.:
Obviously this is not an actual game mod. For that, I point you to my favorite Star Trek Voyager: Elite Force mod. But this video, which was made using several programs (including Adobe After Effects and FumeFX), gives you some idea of what Super Mario Bros. in 3D would look like.