This effect in AMVs and TikTok videos - Some kind of frame morph transition?

https://youtu.be/u5-CF_k0KK0?list=RDu5-CF_k0KK0&t=24

https://youtu.be/u5-CF_k0KK0?list=RDu5-CF_k0KK0&t=59

Looks very cool though I suspect it's on it's way to being overused as I've seen it in multiple AMVs and anime TikTok vids. Still, how do you achieve that smooth frame to frame morph? Looks almost 3D ish.

( I have HitFilm Express ( free ) though even if it can't do it I'm just curious about the technique )