[iPhone Dashcam App] Display speed and location in video playback

Where I live, we’re starting to have a lot of really reckless drivers. I have a dash cam app on my iPhone and I have a mount on my dashboard for my iPhone where I can turn on my dash cam while I’m driving. It does show the speed that I’m driving at, however, the playback of the video does not show the speed I was going or my location, and I need a dash cam that does that. I don’t care if I have to pay a one time fee, but I don’t want to have to pay a monthly subscription or even a yearly subscription, because most of those are ridiculously expensive. On Easter as I was driving home from the store, I had two cars pass me. I was doing the speed limit, which was 45. These guys were going much faster. They started drag racing down the road in front of me and there was oncoming traffic coming, and I caught it all on my dash cam. It scared the bejeezuz out of me because there was other traffic, and a few people walking down the road (no sidewalks). They could have killed somebody. I wasn’t able to show it to the police that day, but I took it in the next day and there wasn’t much they could do because the dash cam didn’t get a clear picture of their license plate probably because they were going so fast. I knew that would probably be the case but one of the vehicles was a bright yellow Chrysler 300 and because we live in a very small town I figured at least they would know to watch out for that car because there’s not that many bright, Canary yellow Chrysler 300 driving around a small town. Because it didn’t show the speed that I was going at, it was also hard to judge how fast they were going (they were obviously going much too fast because I know that I was only doing 45 but because it didn’t show up on the video playback…..) If anybody knows of any dash cam apps for an iPhone play the mile per hour you are going while you are recording, but also show it in the video playback, please let me know. I don’t wanna go out and buy a separate dash cam and install it in my car. Thank you all in advance. 🙂