Over the years, I've noticed a couple extremely obscure film versions of musicals - some of which have turned up (the Greek remake of "Cabaret") and some of which haven't (a supposed film based on the stage script of "Grease," which the director is apparently not allowed to distribute).
This one's a real oddity though.... a 1972 film production of "Jesus Christ Superstar" from the Philippines. I can find NO footage of this movie, and all that seems to circulate online are a couple posters.
I would be VERY curious to know if this even still exists.
Edit: I looked at the actors' names. Amalia Fuentes recently passed away. You may contact her family (the Muhlachs), but they are also actors. Hence, you may have difficulty reaching them.
Victor Wood and Ike Lozada both have Wikipedia pages: