How to create users and groups in GIT

We use GIT on windows and we are looking for such an option where i can restrict my branches with users and groups. Is there any way that i can restrict my users on using branches. How can i achieve this and i am a new user of GIT. Also, is there any option of GUI where i can do this ?
Help on this is highly appreciated.

Hi Venkat. I don’t understand your question, what exactly are you trying to achieve?