Hello,
I don't know of any dvd's apart from the ones we're shown on our internal training courses and I wouldn't know how to get hold of one.
However, Youtube and the like have a wealth of clips available. I just did a search using the term "aircraft maintenance" and it returned 620 hits.
Such as this one;
YouTube - Aviation Maintenance Career and Certification Video
I'm sure it'll help you out.
Shinobi