There are a couple options:

1) Tap the library icon (at the top right of the page to the left of the settings icon) -> tap "Recovered Videos" (at the bottom of the page) -> then select and delete all videos in that foler. 

2) Start over completely by removing ScoreCam, restarting the device, and reinstalling. [NOTE: Make sure you have no videos in the "Recovered Videos" file as these will be gone once you delete the app. Additionally, all your settings will be reset]