Detect standard targets for an AR app unity ?

Hello guys, I am all new to unity. I want to creat an AR app where I can detect a standard tagrets like door hands, windows,shoes,walls... I want to detect all kind of them that anyone can use it from anywhere (deffrent shapes, dimenssions), My question is how can I relaize that and if there is an existing database for this kind of things? I am really lost and i don't where to start.

Thank's for helping