How to track which markers are clicked (Analytics)

Hello,
I would like to track (with google Analytics) which markers are clicked by users, but I don’t know how to do this.
I think, that I should use something like this:

google.maps.event.addListener(marker, ‘click’, function() {
ga(‘send’, ‘event’, ‘category’, ‘action’, ‘label’);
});

Is that right? But I don’t know where to put it in the code and in which file. Could you help me?
BR
Maciej