If you are talking about a plugin that provides macros and you want to see if they are being used in pages, you have two options, depending on which version of Confluence you have:
If you have 5.10 or higher, then you can use the "Macro Usage" section of the "General Configuration" options to see which macros are being used and how often.
If you are running a version less than 5.10, then you need to figure out which macros of a plugin are able to be embedded in a page (by looking at the modules in the add-on screen) and then you'll need to search for it.
The syntax is as follows: macroName: xxxxx, where xxxx is the name of the macro. For example for the Viewtracker macro, the main macro name is viewtracker, so to find it you can search for
You can also include a wildcard * character, so you can find all macros starting with "view" by searching for
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