Recently, I found an iOS app really interesting: LiveUseful, which can make a live photo with some information (photo or texts) behind it. You could spend a little money to support the developer, or use my "lite" version.
Sometimes, we might need to acquire the information from the QR/bar code on the screen, e.g. some streaming videos made by Chinese teams. Due to some reason I don't quite understand, QR code is extremely popular in China, which has already penetrated the whole life of Chinese (in China).