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Hi
For fast face pose estamination you can use algoritms based on 68 points .
Dlib has implementation of alghoritm that finds 68 points in 1 ms ( if you given ROI of face ) . Dlib have standart face detection too but you can use Opencv detection and Dlib estamination I didn't used Grabcut method so can't say that it's what you are searching :)
Plus you can detect face not on each frame because on near for example 5 frames it's pretty same. Maybe you can mach frames and if its too different serch new face pose ...or it's just my fantasy
