Do you see any "animated" scene in the cameras? If you do see animations here and there, the issue might be in space / memory (Might want to close a few running things / make space on your device)
If you actually never see anything animated, then this might be an issue with the device itself that we cannot fix.
Do you have any other device to try it on?
If all fails, we then can issue a refund, if you would like to.