What are the detailed steps to manufacture a console video game for
Playstation and/or Xbox? i.e I am interested in how the the DVD
stampers are made, the encryption process etc...

Thank you for your question.  
 
However, I believe that to answer it well, your question will require
more time and effort than the average amount of time and effort
associated with this price. Here is a link to guidelines about pricing
your question, in the pricing guide:
https://answers.google.com/answers/pricing.html