Like TheWhack said: "one of the most reliable ways to verify a run is through audio", here are 2 ways to record audio:

1. Just put a microphone next to your GamePad or
2. Way better (if you are using a Capture Card): Put a 3.5mm to 3.5 mm audio cable into your GamePad and your PC (the blue audio port), put the GamePad sound on and add this as a new sound input in f.ex. OBS. (That's how I do it.) The only downside: the sound can be a bit asynchronous.

Too bad i don't own a capture card, so i instead record with my phone, turn the volume up on the gamepad while holding it relatively close to my phone. I'll look into this thread again if i ever get my hands on one though, so thanks for the tip!