Startup Idea: Augmented Reality App for Real World Distance Measurement

Startup idea to develop an augmented reality app that can measure the distance between two objects in real world, simplifying tasks like hanging posters or decorations.

I sometimes want to hang a poster or decorations on my wall in the house, however, measuring their dimensions can be a difficult, so I'm thinking it would be nice to have an app that's capable of measuring distance between two objects in real world by utilizing the camera, I think it's possible. not really.