As we have seen, the 3.1 firmware enables the possibility to change the video within the camera roll and now, some guys from the forum ModMyi, have released a new toggle called VideoMover, able to move inside the roll, all Video recorded with Cycorder, video recorder 3G and those downloaded from YouTube.

Add this source "" to your cydia sources and install it from there. Checkout here on how to add sources via Cydia.