How to find out if current active camera is moving

We disconnect the camera update function in the camera controller. It was causing too many problems. We created a system where we place plueprints in the scene that have cinematic cameras, and a camera system manager that sorts through the local cameras, then blends between cameras when a button is pressed. I desire to turn off all interactions and remove all widgets until the camera stops blending using view target with blend. How do I find out if the camera has stopped moving? I tried to get the target velocity but that did not seem to yield any results. Any help would be appreciated.

when starting blend you need to provide it’s duration so just ignore input for same time

Sorry for the late reply. Thanks for the help. We check the duration upon starting then send a signal to the input manager that disables the input for the duration input for the camera by the designer. Works like a charm.