Offline screen keyword Detector with on device OCR technology

I want an app that detects a specific word (including special characters, icons) added by me visible on my Smartphone , whether it is in image, video or any possible format (just visible on my phone screen and the app sends me a normal notification with sound and vibration)... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, App Development, Computer Vision, Image Processing, iOS Development, iPhone, Mobile App Development, Mobile Development, OCR, Software Architecture)