Iphone lost photos and videos when jailbreak
What you need to do is restore your iPhone from the latest backup you made. In order to do that, follow these steps:



As you can see, this is from apple's website, so those are the directions.

If you did not create a backup before jail breaking, it is going to take a more complicated route to find your photos and videos, if it's even possible at that point.

Hope this helps!