I knocked this very rough video up a few months ago when I was asked by several colleagues how you create QR codes.
In and around my classroom I like to have QR codes on posters and wall displays that students can scan with their smartphones. These QR codes redirect students to YouTube videos, student created books review, information on various technologies and much more.
You will have to excuse the quality as it was done in a massive rush and not exported in HD. Anyway, enough excuses. I hope you find it useful.