// gets the person group info
    private void GetOrGreateUserGroup()
    {
        if (!string.IsNullOrEmpty(userGroupId) && faceManager != null)
        {
            try
            {
                personGroup = faceManager.GetPersonGroup(userGroupId);
            }
            catch (Exception ex)
            {
                Debug.Log(ex.Message);
                Debug.Log("Trying to create user-group '" + userGroupId + "'...");

                if (faceManager.CreatePersonGroup(userGroupId, userGroupId, string.Empty))
                {
                    faceManager.TrainPersonGroup(userGroupId);
                    personGroup = faceManager.GetPersonGroup(userGroupId);
                }

                Debug.Log("User-group '" + userGroupId + "' created.");
            }

            initedGroupId = (personGroup != null) ? personGroup.personGroupId : string.Empty;
        }
    }