Scan iPhone files system for lost application data

You need to evaluate if your lost video is important, as iPhone is really difficult to make a backup like what we did for computer, especially "sector backup".
If video is important, I would guess some companies may disassemble iPhone, pick out NAND flash chips, then recovery from there. Pricy, but more reliable.

 

With device being jailbroken, you have the chance to better make a device backup, but I am not familiar with data recovery matter. I can only guess jailbreak can help data recovery.
I would like to consult data recovery companies to start hardware level recovery, if data is that important.
BTW, after this incident, learn to make a backup regularly.

 

If you jailbreak you get root folder access which should help.

 

It would help, yes.

But there's still no inherent ability to treat the iPhone like a hard drive where data can be scanned, analyzed and recovered.

OP could probably browse through the folders of the application but I doubt he'd find anything.

 

As I know, the file system in iOS and the primary format in OS X is HFS Plus. But it doesn't matter on rescuing your lost video, and the iOS uses sandbox to protect app data, it means the regular data recovery software won't help on this case. Give a try with some iPhone data recovery software, here is how does they work:

A deleted file is typically not immediately overwritten on your iPhone disk, but more often has its entry deleted from the file system index. Simply put, you swipe to delete a message on your iPhone, the data actually is still stored on the device, but you cannot see it through iPhone interface. In such a case, the deletion can be easily reversed.