If a major artery like the carotid artery is hit (as appears to be the case in that video from the exact location of the hit in the neck), the blood loss is catastrophic. I am speaking as someone who has known someone who got stabbed in the carotid artery, unless the person is like literally standing just outside a major hospital Emergency Department trauma center, it's not possible to save as the blood would gush out faster than it's possible to replace. Even in the stabbing case, 5 units of blood were used in the space of a few minutes, and the goal was simply to keep the patient alive long enough for the trauma surgeons to close the carotid injury. Amazingly this was done and the patient was discharged from ICU a week later, though with obvious psychological trauma from the near death injury. However a single knife stab laceration is more easily repaired than the likely more ragged wound caused by a high powered bullet.
No medic on site would have been able to save this guy as the resources simply weren't there.