Want to add a little magic to your scroll interactions? ScrollMagic is the go to scroll effect plugin. It essentially allows you to turn your scrollbar into a playback scrubber on an animation and do some pinning/syncing/parallax effects and powerful animations with GreenSock (https://greensock.com/docs/#/HTML5/).
Like with anything this powerful, there is a bit of a learning curve, but its well worth learning.
This plugin is an evolution of Super Scrollorama by John Polacek: (http://johnpolacek.github.io/sup…).