DVDs, books and especially YouTube can never accomplish the quality and success of a training session on the mat, at least in my opinion.
But they can effectively support your learning and training process.
Personally, I enjoyed the following DVDs very much and they helped me to deepen my understanding for my jiu-jitsu and the techniques:
Demian Maia – Science of Jiu Jtsu 1 und 2
Ryan Hall – 50/50 DVD Serie
Saulo Ribeiro – Jiu-Jitsu Revolution 1 + 2
Kit Dale & Nicolas Gregoriades – Beyond Technique