Is there an Android app to overlay MPH? Or record both cams with MPH overaly?

So I like to record myself driving some back country roads and show friend, and I use my M8 to record front and back cam so they can watch me and the road.. but that doesn't really give a feel for the speed.. I know there are apps that'll let me record the back cam and shows MPH.. is there a way to get MPH, front, and back cam? If anyone knows that'd be great.

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