This is incorrect on many levels. A ventilator always requires intubation. Sometimes that's through the mouth, sometimes through the nasal passage (both cases are referred to as endotracheal), and rarely through a tracheostomy. Ventilators do have some monitoring capability, but require consistent attention from respiratory therapists. The chances of infection (VAP), pneumothorax etc are serious without careful monitoring by a trained, experienced medical professional. These aren't plug and play devices.

Some patients might need supplementary oxygen delivered through a canula, or through a mask, but that's nothing like the procedure used for a vent.