Is there a way to 'lock an actor to vieport' not 'viewport to actor' ?

Is there a way to lock an actor (camera) to a viewport?. I know there is a way to lock a viewport to a actor but I am looking for the opposite.
For example if I find a good composition in the viewport perspective and want my existing camera to recompose to this position I need to be able to lock a actor to the viewport. Can we do this?