As a follow-up—and, again, as @dave27 and I have previously said, I recommend pulling the microSD card if at all possible (though I recognize that this can be difficult depending on the camera’s location and how it’s mounted)—I wanted to mention an online tool that Forum Maven @IEatBeans created specifically for this purpose. Getting the 12-14 files, as @dave27 noted, and then joining them once you have the card in hand should be fairly trivial.
Edit: The other thing I forgot to mention earlier is that if you’re using the app’s Record feature during playback, then you have to do that real-time, meaning that the video is playing back from the camera to the phone in real time while the phone app captures that and saves it in a video file. If you just need a minute or so of footage and don’t want the highest video quality, then this might be a reasonable method, but pulling the microSD card is a much better solution overall, especially if you require longer video segments.