However stress can be a normal and healthy reaction to an event. I still maintain that it causes harm when the conflict between the event and the reaction cannot be resolved, and especially when it is prolonged.
I agree wholeheartedly that an ability to change our attitude can aid in diminishing the stress element, as the video suggests. This would work particularly well if the person is prone to suffer stress abnormally.
But, as I have already said, normally if the event that leads to the stressful situation can be resolved, then the stress element should diminish or hopefully disappear.
And sometimes a person is able to choose a situation that may be stressful, and, I suggest, by being more in control of events that person is more likely to manage their stress reactions in a positive way.