Bootstrap Affix for in-post navigation?

Hi
I need to add some support for longer posts to my custom wp theme. Aside form obvious post pagination, Bootstrap Affix could by nice way to let users navigate longer posts. I am already using bootstrap. But I have no idea, how to implement Affix in the single.php in a way, that would create navigation based on h1 and h2 elements of the post (for example). Even better would by option to turn affix off and on for individual posts in post editing interface.

Anyone have any idea how to do that? Thanks in advance for any help 🙂