well its a ok idea. Theres certain things u have to take into consideration though. Say this is online, while the ur watching the bullet, you are vunerable to any attack and cannot defend urself until the bullet cam has finished. You cant have the whole game stop so you can watch YOUR bullet and then continue cause thats just unfair.
This has been doneon other games already.
Good as a killcam, but not during gameplay like kaduna said it will leave you unable to defend urself while ur watching ur bullet fly whilst someone's creeping up behind you. Plus it'll get pretty boring after a while.