It's possible to find it so long as you haven't formatted the card. In order to do so you'll need an SD card reader for your computer and a decent program that specializes in data recovery (google it).
Since your lost files are video format, you can try some video recovery programs or sd card recovery programs to see if it will help. But before your files are recovered, better not save more files to your SD card.
Take the SD card out of your Android phone and use this Android data recovery software to deal with it, it works great for my Samsung Galaxy (Android). Regards.