How can I apply a group policy to a security group?

Start the Active Directory Users and Computers MMC snap-in (Start - Programs - Administrative Tools - Active Directory Users and Computers)

Right click on the container (OU or domain) that has the Group Policy Object whose permissions you wish to change and select Properties

Select the 'Group Policy' tab

Select the GPO from the list and click Properties

Select the Security tab

Modify the permissions so that only the required users have the read and apply privileges and Administrators who need to modify the GPO have read and write
Click here to view image

Click OK to the dialog

Click Close the containers properties