[Root]YouTube AdFree solution without Xposed
1. Uninstall YouTube
2. adb shell
3. su
4. mount -o remount,rw /system
5. mkdir /system/app/YouTube
6. Download the adAway apk here
7. Move apk to /system/app/YouTube
8. chmod 644 /system/app/YouTube/yourAPKFileName
9. mount -o remount,ro /system
10. Restart your Android device.
This is a YouTube AdFree solution for Android Root users with someone who do not want or cannot install Xposed framework.