After deployment of vCenter Operations Manager there are two users in the system that have access to the entire environment. These are the built-in admin-user of vCops and any user that is assigned to the Administrator role in vCenter. In the image below you can see that there are two privileges assigned in the Administrator role that allow anyone assigned a permission with this role to access vCenter Operations Manager as an administrative user.
Other users can also be granted access to vCenter Operations Manager as a user or as an administrator. Create a new role or use an existing role and enable the required privilege in that role. As shown in the image below. These privileges are in the Global category.