Best way to make indirect control?

Hello.

I want to make so that character movement was controlled by slider. If slider handle is at the bottom then character is not moving/stop moving. If slider handle at the top, character start moving.

The question is, how to make. Shoud i use interface/widget blueprint for it. Or make an pawn blueprint and atach it to camera?

And can you me some simple example of it or similiar system.

Thanks.