Q: How do I delete videos from my ipad

Hi,

Follow the instructions here >  Delete music, movies, podcasts, and other content from your iPhone, iPad, iPod touch

If they are personal or home videos that you took yourself, and they reside in the photos app, you delete them the same way that you got them onto the iPad. You have to unsync them using iTunes. You use that same process that you would use to remove synced photos from the iPad

Sync photos to your iPhone, iPad, and iPod touch in iTunes - Apple Support