Yes, it depends on which area of dance you are learning. Generally recorded video posted, some good people also produce reverse mirror version, so you learn to dance faster, reverse mirror version of the original video left and right reversed, you learn with the video left and right the same, so that learning is convenient.
While there are generally instructional videos, than to teach you to dance, it is better to download the software, see their favorite dance, then use the software to convert the video, their own home slowly follow the learning.