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

 

 

 

 

 

GroundFighter – Demian Maia

 

Ryan Hall – 50/50 DVD Serie

 

 

 

 

 

 

 

GroundFighter – Ryan Hall

 

Saulo Ribeiro – Jiu-Jitsu Revolution 1 + 2

 

 

 

 

 

 

 

GroundFighter – Saulo Ribiero

 

Kit Dale & Nicolas Gregoriades – Beyond Technique

 

 

 

 

Meerkatsu – Kurzbeschreibung