Access control on aggregate

I need to put access control on users like certain user should be able to see a certain group of forms only how to do this on aggregate

Well i am just starting with ODK so i may be off but ODK Central, which is the supposed to be the next iteration of Aggregate, has access control built in by default. There are projects that you can assign people to and they will only see forms from those projects.
Read the document carefully, since it is a relatively new project and is evolving quickly. It came out of beta recently.