This video demonstrates agonal breathing (occassional gasps). This type of breathing is common immediately following a cardiac arrest and should not be confused with normal breathing during your assessment of breathing. It is not a sign of life and commencement of CPR (Cardiopulmonary Resuscitation should start).
The Resuscitation Council states, “Be suspicious of cardiac arrest in any patient presenting with seizures and carefully assess whether the victim is breathing normally”. The video gives an example of this.
Further reading on the Resuscitation Council website: https://www.resus.org.uk/library/2015-resuscitation-guidelines/adult-basic-life-support-and-automated-external