Interesting application!
I would guess, yes. It would be possible for somebody with coding experience, but new to B4A.
There are camera libraries for displaying a full-screen preview, focusing upon button press, and then taking a snapshot.
I have seen posts mentioning OCR libraries, although I have no experience with these.
Once the OCR returns the text, there are Text to Speech libraries for B4A.
I can see the details of an application like this being tricky – how do you isolate and focus the desired text. What happens if OCR is less than 100%.
Have you searched Google Play? I bet there are free or low-cost apps that do what you want. They have probably addressed the tricky details and could probably give some ideas.
Barry.