I need a C# script, in case the user refuses permission, a message appears that he must go to the settings in order to allow the permission the overloaded image here enter image description here
If you try searching a bit on the Google or in Unity Docs, you'll find Requesting Permissions article. I would suggest you to go through the complete documentation to get the better idea.
However, to make things easy, you can refer to below code:
using UnityEngine;
#if UNITY_ANDROID
using UnityEngine.Android;
#endif
void CheckCameraPermission()
{
#if UNITY_IOS
if (!Permission.HasUserAuthorizedPermission(Permission.Camera)) {
// PERMISSION NOT AVAILABLE ON IOS, DISPLAY POPUP MESSAGE
}
#endif
#if UNITY_ANDROID
if (!Permission.HasUserAuthorizedPermission(Permission.Camera)) {
// PERMISSION NOT AVAILABLE ON ANDROID, DISPLAY POPUP MESSAGE
}
#endif
}
I hope that answers your question.