User Roles and Permissions

[eluser]xtremer360[/eluser]
I am trying to figure out how I'm going to integrate my user groups with permissions. What I would like to do is be able to manage with my application what user groups are able to handle what actions such as create, edit, delete, read. The basic four CRUD functions. In all of my controllers I have these four functions. I am looking for options on how to handle this functionality. I came across the following link and would like to know if anybody has implemented this class into their own application and what they have thought of it. If you haven't do you have a suggestion that I can consider and research more on.

https://github.com/EllisLab/CodeIgniter/...sion-Class

I have also come across how Halogy CMS performs this exact functionality and would like to know how hard it would be to develop this same thing or if the permissions class is the way to go.

http://www.youtube.com/watch?v=kxdZVdoBPNE

[eluser]xtremer360[/eluser]
Any ideas on this?