If you think that retouching on a photograph is amazing, check this out. Foton has claimed to develop a software that is able to perform beauty retouch on 4K (4096 x 2160) video without quality lose and they are not doing it frame by frame.
Apparently, they have managed to make a software to track the facial changes and make the edit consistent across the video. I know it sounds quite amazing. It is. Check out the video.
BTW, this video is one year old. I went to Foton Japan website but it is not in English format. Not sure if the technology is available now or not.