How to run ar applications that require a webcam made with Unity?

Question

C++ / C#

The essence of the question is this: I made a game (With additional reality), the game is made on the unity engine using vuforia. Everything works perfectly in the unit itself, and if you make this application on your phone, it also works. But that's not the problem: if you make a game specifically for the PC (And the game will require a camera), then after launch - you can't see anything (Black screen). Even if everything is connected correctly, re-created the application, checked its performance in the unit, the finished application will still not run on the PC. How to fix it?