AdBlock Plus is an famous adblocking software that blocks advertisements on web pages. This plugin detects if user is using adblock or any other adblocking software or not and sends the tracking data to google analytics. This plugin will help you to know how many users visiting your website are blocking AdSense and other ads.
You can see the tracking details in you Google Analytics -> Behavior -> Top events -> Event Action
This plugin may not work as expected if the user blocks Google analytics as well. In this case you will need an alternate way to track the data.
How to use it?
Install the plugin and see tracking data on google analytics. Behavior -> Top events -> Event Action