Here's a quote from IMDB on it:
"A wonderful documentary with featured performance clips and interviews featuring Jim and Jane Henson, Frank Oz and others. The documentary focuses on the Muppet phenomena and a look at the behind-the-scenes of the Jim Henson Company in its glory days. The Documentary was originally produced for French and British television and eventually found it's way to the United States."
It's a great special about the company.
My other favorite Henson company documentary I believe was titled; "Of Muppets and Men: The Making of the Muppet Show". I haven't seen that video in over 20 years. That was great too. The video's title was similar to the book title.
I hope that video is eventually included in future Muppet Show DVD sets.