Smart scrolling

Scroll up or down with your head,

-might not work in some page -require webcam camera -require camera access permission (you need to click 'allow' to start this function)

Based on course project, detail can be found here http://superdictionary.blogspot.com/2014/12/no-hands-scrolling-on-webcam-motivation.html

libraries used here: -http://trackingjs.com/ -https://code.google.com/p/dat-gui/