Jack Brooks has one that isn't too bad, and I think Wallace Gusler has one as well. However, that being said, as good as those videos might be and as skillful as those gentlemen are, you really need to have someone show you how unless you have a natural talent for doing it. Most people need help in sharpening, getting the proper heel, using correct hammer technique etc. Not easily done from a book or video. I had both videos but floundered around until I took some classes at the WKU NMLRA Gunsmithing seminar which put me light years ahead. And even after that there was still a learning curve. I love engraving but it is not something you can learn from a book or watch someone on a video. There are various hands on engraving programs around, it will put you far ahead to try and find one. I think some member of this forum provide this, save your nickels and sign up with them.
Also though, remember most builders of American rifles, even some of the well known masters were lousy engravers. We are so used to seeing modern engraving, done by people working under microscopes that we think that was how it was done in this country in the old days. Instead most was done by some rum soaked guy using homemade tools, with no artificial light, no magnification except glasses if he was lucky and after minimal training during his apprenticeship. This is NOT an excuse for poor engraving, just that you don't have to have years of training in Europe and belong to a guild to do appropriate colonial work.