We have been experimenting with a GoPro camera attached to a register terminal at the far corner of the counter in the newsagency, placed such that we can see people entering the business, where they head, how long they are in-store and whether they purchase.
The vision from the GoPro camera is another data point useful in understanding what happens in the shop and useful in guiding business decisions based on the data.
Using a GoPro like this is more useful than a fixed CCTV as it is flexible, it an be moved as needed and placed in different locations for different occasions.
Being small and portable, the GoPro could easily be situated to show people walking past the shop. On playback you could see those who look in the window and stop as well as those who walk on by without even noticing the business.
The opportunities are terrific. I see the Go Pro as being especially useful in businesses that are changing and attracting more than the regular shopper who can be as store blind as those who work in the business.
I have written here previously about the value of sitting outside the business and looking in, watching shopper movement. This camera offers similar benefits without you have to commit so much of your own time.