In movies or games such as Call of Duty: Ghosts The outer space mission is depicted as shooting in space, whether it is a shotgun or a gun fired in space and what is the effect?

Returning to the original question, the answer is yes, it can happen, a conventional firearm in most circumstances will work well even in a room without oxygen.

This is because inside the gunpowder shells have their own oxidation material which is needed in the combustion process without an external source.

But there is a difference between shooting on earth and space. That is sound, there is no sound of eruption because in a vacuum does not allow sound waves to be delivered. Second, if on earth shooting will make the bullet target forward, but if in space what happens is when the bullet shot to the front of the shooter will be shot in the opposite direction, bounced or even turned backwards in the infinite space. Third, if on earth , the bullet will accelerate until it stops because of the target or if it misses then the bullet will continue to accelerate until its energy weakens and the earth's gravity pulls it to the ground. While in space, bullets will be more accurate when heading to the target because there are no air and wind barriers (the speed of the bullet is the same on earth and in space), but if missed the target there will be a unique phenomenon that occurs,