How can I delete videos from my iPhone?

[iMore Question]

Basically I can't find a way to delete them. The delete or dustbin icon becomes unusable.

 

[Just_Me_D]

if you've every synced those videos with iTunes, you may need to connect the device to iTunes in order to delete them.

How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store - Apple Support

Manage content manually on your iPhone, iPad, and iPod - Apple Support