I remember seeing something like this where it could identify signs and things, but the quality from what I recall was not great (could be way off and have many duplicates). I might be remembering Mapillary, which has a Map data button at the top left and seems to show signs [0]. I don't think it auto-updates OSM based on these data.

[0] https://www.mapillary.com/app/?lat=52.4758193487485&lng=-1.8...

Oh I don't have a link but there was a project just like this someone hacked together a while back. I think it used Gemini live or something and as you walked and scanned things it would suggest changed to the map. It was a rough demo but seemed promising.

I've been wanting to do something similar but just by taking photos of menus and updating the POI with new hours/website/phone etc

Looks like a glue-together narrow-purpose kind of app that AI is relatively good at producing.