If you wish to make your own animations here are some tools you can download.
d2v is a command line tool which can create animations. It takes as input a xml dance file and produces an mp4.
This link is to a bzip2ed tar file containing the source code and a Makefile. It requires libxml2, libungif, libav and gtk+-3.0.
It is designed to run on a unix-like environment, if you're on Windows I guess you'd use WSL now, on the mac macports will work.
Warning: It's not user-friendly. Its error messages are designed for me and may not be very meaningful to anyone else.
And, of course, the dance xml is documented here.