players camera view to toggle and event?

I am trying to find a way so that when my players camera ( Fps mode ) looks in a direction, and event such as a matinee is triggered.
How would one go about doing this? i have tried multiple blueprints out and i just cant seem to figure it out.

Thanks.

Have you tried the LineOfSightTo command?

tried, but not sure what exactly to do with it.
All the tutorials i’ve seen are not going for the same idea i need so i get lost.