I'm trying to run video on a TV using a raspberry pi on a signal from a reed switch. The hardware part is clear. What to do with the program?

Question

Raspberry Pi

I'm trying to solve a problem like this.
Worth a TV. Raspberry pi is connected to it via HDMI.
When the door in the room opens, the reed switch connected to the raspberry is activated. I want the video file to be played on the TV for 10 seconds on a signal from it, and then pause, and so every time after the reed switch is triggered.
Tell me where to dig, is there anything more or less ready to implement such a task