Custom Software Tutorial Videos

We run a free preschool management app in South Africa that helps preschool/early childhood development centre owners manage their schools effectively. We screen-record demo videos on a mobile phone and add these demo videos to our YouTube playlist. YouTube does not currently accept some of our videos because they display personal information (demo account information which is fictional). We need assistance to edit our demo videos, specifically to mask any personal information. We currently have 2 videos (3 minutes each) which need masking. More videos will come in future