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/
谷歌浏览器、其他Chromium内核的浏览器
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