I used this app: Raibu - Live Wallpaper - Any Video off Google Play.
Here's a video tutorial on how to do it: https://youtu.be/dQw4w9WgXcQ
🚀 Features * ⏲ CountDown↯ Anything * 📆 Quickly Import Calendar Events * 🔔 Notification * 🎯 Light/Dark Mode * 🎨 Beautiful Theme & Accent
iOS: https://apps.apple.com/us/app/countdown/id1559515251
Android: https://play.google.com/store/apps/details?id=com.ajay.countdown