How was the Emma Watson 24 years video made in 34 seconds?

Question

Video processing

Actually a subject. The video itself https://www.youtube.com/watch?v=opme64dMTw4
There is a series of such videos with different celebrities.
Could you tell me, please, how is this done, not by hand? It is immediately evident that the eyes, nose and mouth are "fixed".
Give a direction where to dig, what technology/software is used to analyze photo collections.
Thank you.

Answer 1

normal morphing - bunch of software
https://www.google.ru/search?q=morphing+software