BP: highlight and select object than click on it to play media (in widget)

Hi,
As i ve written in my previous post, i am new to UE but trying to make a small game. The idea is to present my 9 sculptures made in Zbrush. I am an artist and programming is a tough thing for me. I managed to create a system that highlights the actor in the line of my sight. But here is the problem: i want to click (after hightlighting) on my sculptures to open widget with imported animation (media source) of it.
I made a research and i got to know that:
,If you do the line trace and find an object, and send an interface call to the object and it supports that interface, then the object can use the AddWidgetToViewport call to open a widget for you."
But honestly i dont know how to implement his.
Please help <3
I attach screenshot of my code (selecting and hightlight)