Face swapping, Image morphing, Image warping, Face substitution, Face replace.
Face swap. 1.Detect face. 2.Detect points on face. 3.Face triangulation. 4.Pise-wise affine warp. 5.Poisson blending. 6.Android or iOS integration.
Image Morphing - local (non-parametric) warp
http://alumni.media.mit.edu/~maov/classes/comp_photo_vision08f/lect/07_Image%20Morphing.pdf
https://github.com/arturoc/FaceSubstitution
https://github.com/jorticus/face-replace
https://github.com/alyssaq/face_morpher
https://github.com/royshil/HeadReplacement