The carving problem is not due to the encryption but most likely because as of now there seems to be no way to perform a physical dump of the device in a forensically sound manner.
the videos are stored in the backup as long as they are in the camera roll domain.
I'm not any familiar with icloud backup but maybe if you have the credentials you can access the online storage and recover the informations you need.
it might be a bit "dirty" to do,
but if you have the iCloud account information and a new iPhone you can restore a backup from icloud on a spare device for content examination.
http://support.apple.com/kb/HT4859
maybe there are other ways, but as said before, i'm not aware of them, and yet i'm curious to hear from others on this board who know more on the topic
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