You can sometimes get back a video on your iPhone even if you do not have a backup. When you delete a video on your iPhone, it goes to the Deleted folder. It stays there for thirty days. After that, the iPhone gets rid of it for good. The iPhone marks the space where the video was available for things. Then the iPhone can overwrite that space quickly. This is because of how the iPhone manages its storage and keeps things secure. So it is hard to get back videos on your iPhone if you do not have a backup on iCloud or iTunes. It is even harder if a lot of time has passed or you have used your iPhone a lot since you deleted the video. You can try to get your iPhone video, but it is often not possible. Getting back an iPhone video recovery without a backup is very difficult