S.P.
I'm not up with the latest info in this area.
However, it seems to me that Bradley was biggest in the '50s.
It's not likely that someone has taken any Bradley films
and converted them to videos.
Try googling Bradley. Also LaMaze.
Your public library may have some books on Bradley and LaMaze.
Also, if there's a midwife in your area, that might be a good resource.
Good luck.
S.