Hi,
Thanks for your interest in our work. First, you should have a look at the documentation of the package:
and maybe also at Bob's generic documentation here:
More specifically and since this package was meant to be used with databases containing several video sequences, the documentation on Bob's databases package could be useful as well:
Finally, I advise you to clone the bob.rppg.base package and directly look at the code (start with the scripts)
Best,
Guillaume