Hello Sir,
As per my understanding, you want to get an application build for both iOS and Android, which has the feature of optical scanning, and face recognition like features. As per my experience, I have created applications both for android and iOS using OCR library to detect energy meter readings, qr codes, etc. However, I don't have done anything related to face recognition. But I can go on and check for how it can be done, if it is possible, then it can be surely implemented. So inorder to understand the exact requirement, let us discuss so that we can create a robust and high quality application.
Thanks