Interested in developing add-ons - Is tracking class passive CDs possible?

[SortOfKindlyNot]

Hi,

I'm interested in learning to develop add-ons. My idea for my first add-on is similar in nature to the buff/debuff timers except that it would track class passive cooldowns. For example, on Dragonknight, the class passive Mountain's Blessing gives 3 ultimate whenever you cast an Earthen Heart ability which can occur a maximum of every 6 seconds.

Before I delve into the details of writing add-ons, is it even possible to track class passive cooldowns, like Mountain's Blessing, via an add-on using the API?

Thanks