Microsoft has developed TAG. This give users an opportunity to print out a bar-code label/stickers that can be used on paper or any type of material which when captured onto the microsoft tag app connects you to the url of the label.
For example if you have a poster for a rock concert on a wall with the tag barcode image on it. You could capture that image into the microsoft app and be taken to the video advertisement for the rock show on youtube. I am going to be trying this and will come up with the result in a few days