No doubt you send your students to masterclasses and have perhaps even participated in or conducted one yourself in the past. There are many fantastic masterclass videos on YouTube which I won’t worry about listing here (just search for whatever piece you’re looking for + “masterclass”), but there is a great channel called MMF Masterclass to which you might like to subscribe.
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The Masterclass Media Foundation features masterclasses with the likes of Boris Berman, Steven Kovacevich and plenty more on a variety of instruments and different works. Unfortunately, the videos are only excerpts of the full masterclasses which can be ordered on DVD, but the clips remain a great reference nonetheless and give you a good idea of whether it’s worth ordering the full version.
Here’s a list of all their masterclasses with links to the clips. Worth checking out.