The earliest Campagnolo workshop videos that I was ever aware of were these ones with a white title slide. So far I have found the 9 episodes offered here. If anyone knows of others please let me know!
They appeared on two CD-ROMs published by Campagnolo dated 2006 and 2007. The files on these CD-ROMS have dates of 2005 and 2006 respectively.
The very low resolution, the lack of sound and the 5 by 4 aspect ratio are all kind of quaint.
For derailleur junkies, the episode about the 10-speed chain includes shots of a Campagnolo Record (RD4-REXS).