How much calories burned during this workout? (link)

Hi everyone, I just want to know anyone had done this workout before? my friend said it is popular but I never heard of it. Well google about her and found some interesting story. The instructor in the video is Jung Da Yeon. She is 46 yrs old and she claim she lose weight using the workout. the workout doesn't seem that hard. some opinion on this workout and the calories it burned?

https://www.youtube.com/watch?v=aDK49ROk3iw