I do not know of a solution to show a popup on a link, but dependent on your use case (especially the number of links and it's representation on the page) you may choose to hide the link with a macro. That is the user won't see the link (or anything that is inside) according to their permissions.
There are a couple of plugins you may choose from to get this functionality:
More and more people are building their careers with Atlassian, and we want you to be at the front of this wave! Important Dates Start the Certification Prep Course by 2 April 2019 Take your e...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs