Is there a way to keep a banner open on the screen from an app running in the background?

I'm attempting to create an app that will give constant feedback to a user about exercise information on screen, but also allow that user to open any other app. For example, say someone went for a jog and was using my app, they would a have a constant banner giving their current pace (which would be coming from a bluetooth sensor) but also be able to access any other app without that banner leaving the screen. Is that possible?

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There is no mechanism whereby your app can overlay a persistent banner on top of other apps. Users can only interact with whatever app is currently running in the foreground.