Hi,
I am new to asterisk and I want to knowif any video tutorials available to help in installing and administrating the PBX?
Thanks,
Jassim
You really should take 5 minutes and google for basic Asterisk documentation 
These are the first few hits:
voip-info.org/
wiki.asterisk.org/wiki/dashboard.action
asteriskdocs.org/
astbook.asteriskdocs.org/