Windows 10 Feature updates disabled camera access and some of the apps ... else you will need to download an older version and install it. Most available USB webcams are UVC (USB Video Class ...

The Realtek camera controllers are designed for notebook and desktop PCs. This driver offer support for Windows 10 64-bit and 32-bit.

Since this is a Universal app, you can download the latest version of your drivers for Windows 10 by following the link. Sometimes the Camera resource is stuck, and reinstalling drivers frees it up.