request from owner of an e-book site

A client sent this unique request for a ebook based wordpress site he is building. Can you please tell me what I should tell him?

At present libraries use bar code scanners to scan a books bar code, to check out books, and to put that information into their system/records.

I need to place the results of the scanned image (bar code data) into my form so a record could be placed effortless by the librarian. There must be a plugin out there, I am just not sure which one will accomplish this action. You can actually get a scanner app from the app store for your phone or tablet some are free and some cost, the question is what application turns that scan image into readable format and fills my form.