While it isn't strictly pantomime without props, I find old silent movies help a lot when trying to show young actors how to free up their bodies and made them more expressive. There is an official Charlie Chaplin YouTube channel with a ton of clips from his films that I've used extensively. I have them watch a few clip (Charlie in the lion cage, the ending of City Lights and the window breaking scene from The Kid) and analyze the performance style. I then break them up into groups and have them script a 2-3 minute silent-movie style pantomime scene complete with background music and title/dialogue cards.
As far as other clips go I usually show a variety of the following:
Mumenschanz on the Muppet Show has several incredible routines, my favorite being the clay faces.
Mummenschanz on the Muppet Show (1976) 4 of 5
Jerome Murat does a statue pantomime that is just sublime.
https://www.youtube.com/watch?v=If6gUDs
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Robert Ellis
North Richmond VA