public static async void addFaceToPerson(string base64, string GUID)
 {
     var personId = dictionary[GUID].PersonId;
     var result   = Task.Run(async() =>
     {
         return(await Globals.faceServiceClient.AddPersonFaceAsync(Globals.personGroupId, personId, ImageTools.Base64ToImage(base64)));
     }).Result;
 }