There is a shootout sequence at the beginning of the film. Several people and zombies are shot with bullet holes and blown apart wounds, with lots of blood splatter. One man's head is completely blown apart with a shotgun, with chunks of it seen flying briefly.
A zombie accidentally walks into a helicopter wing, which slices his head open. Blood is seen oozing everywhere from a distance.
The film features gory carnage throughout. The camera does not always linger on the details for very long but it sometimes does. In one scene we see someone graphically torn apart and eaten alive by zombies. They rip open his stomach and chew on his guts and tear him apart limb by limb and we see all of them feasting on his insides and body parts. This scene is EXTREMELY graphic and shown for a very long time. By far the worst part in the film.
Zombies are shown attacking victims, biting (in close-up), tearing flesh and disemboweling their live prey. The creatures can only be killed by decapitation or destruction of the brain, so the characters are forced to defend themselves with firearms and bladed weapons, inflicting bloody bullet wounds, decapitations, dismemberment, gruesome blunt-force trauma and vehicular homicide on their undead attackers. Most of the killings are gory and detailed, but shown only briefly. There are many, many, many zombie killings. It should also be noted that the human-on-zombie violence is largely "kill or be killed".
Blood splatters in tremendous amounts for both humans and zombies.