how can i make " if the player camera view *object* a matinee get played on level blueprint

how can i make " if the player camera view object and nothing is blocking its view a matinee get played on the level blueprint

and how can i get player pawn sensing component to level blueprint

Try using PawnSensing so that you can store actors that are visible to the camera. There are many tutorials on how to use AISensing, which is nearly the same to PawnSensing.
Here’s one of them created by Tesla: Unreal Engine 4 Tutorial - AI Pawn Sensing - YouTube

i figured out how to do it
now how can make the see pawn detect an object