If you use CameraCaptureUI, the user will be prompted for permission automatically. But the DeviceInformation API does not indicate whether or not the user has granted permission.
Here is sample class that you can use to see whether a camera is available, with support for data binding
 

using Common;
using System.Collections.Generic;
using System.Linq;
using Windows.Devices.Enumeration;
 
 
namespace Helpers
{
[...]