Get FOV of webcam

I want to do some simple AR thing without plugin like vuforia. The first thing i have to do is making the perspective of unity to match the hardware camera. Do you know how to do that? in Android, iOS and/or computer.

Cameras and webcams do not generally broadcast their FOV information to the computer, due to it varying greatly. I think you’ll just have to find the camera specifications, and manually enter the camera FOV into your script. Sorry.