Is there a way to retrieve computer name and who logged in active directory in windows server 2012

You need to first enable logon auditing to have Windows track which user accounts log in and when.

The Audit logon events setting tracks both local logins and network logins. Each logon event specifies the user account that logged on and the time the login took place. You can also see when users logged off.

http://www.howtogeek.com/124313/how-to-see-who-logged-into-a-computer-and-when/

Are you looking to see who access AD and did changes?
Here is a link to a publish how to from MS

https://technet.microsoft.com/en-us/library/cc731607(v=ws.10).aspx

Here is a big discussion about using login scripts for that purpose:

http://blogs.msmvps.com/kwsupport/2005/02/24/lazy-mans-way-to-track-user-logonlogoff/

thank you