Overlay Speed on Dashcam Video

I have raw footage from my dash cam and the matching speed data file. I need the car’s real-time speed displayed on the video for the entire duration. Playback speed stays exactly as recorded; the only change is adding a clear, accurate numeric overlay that follows the telemetry frame by frame.

I’m flexible about the overlay’s exact position and style as long as it remains readable and doesn’t block important details. Accuracy is the priority, so the final render must keep full sync between the moving image and the speed readout.

Deliverables
• One finished video, same resolution and frame rate as the source, with the live speed overlay applied.
• Your working file, script, or command line (Premiere, After Effects, FFmpeg, DaVinci, etc.) so I can reproduce the process on future clips.

Tell me which input format you prefer and the software you’ll use, and I’ll upload everything straight away.