How to know if matinee is playing?

Say for example that you want to let the player to some stuff while a cut-scene is playing. How can you know if currently, a matinee object is playing, given you have a reference to it?

In earlier versions of the engine I could get the MatineeController inside of the level blueprint which could provide that information. But trying on 4.5.1 It doesn’t seem that its there anymore.