In fact, these dance instruction can be searched in Youku (because it is a dance instruction, there is no need to pursue HD, after all, we want to learn is the movement rather than look at the face). For example, nobody, as long as the search bar type "nobody dance teaching" can find a lot of (because it is a big hit hit song ah, basically a dance class have taught)
As for the mirror teaching you said, nobody is there. But sorry sorry no mirror teaching version. After all, these are people spontaneously recorded, so it is not too picky. I'm sure you can learn it by heart, fighting!