Stunt doubles have been used in cinema since it began, with filming often done at a distance or involving careful blocking so as to hide the fact someone else is doing a stunt.
Since the turn of the century though, digital face and head replacement has become more commonplace and developed exponentially. Its reached the point that as long as you have the budget for it, you can get stunt doubles to act out any scene and use CG to make them look like anyone else to such a degree the illusion is effectively flawless.
New video FX reels from Universal Production Partners and Rodeo FX for Denis Villeneuve’s “Blade Runner 2049” shows how far the tech has come. Turns out quite a few scenes in the movie involved Ryan Gosling’s photogenic face being CG mapped onto his stunt doubles, and other scenes where you wouldn’t think CG was necessary – it’s there and more extensive than you probably guessed.
“Blade Runner 2049” was recently shortlisted for the 2018 Oscar for best visual effects.