How to recover data from deleted account?

Hello

My girlfriends dad borrowed our Nvidia Shield Tablet. He recorded some videos using Guest account which i made for him. After he gave us back Shield, i removed this Guest account (for safety and performance). He asked me, if i can send him his videos o.O. So as can you see, case is important. Is there any possibility to recover files from account that was deleted and is not anymore accesible on hardware? Shield is running on 6.0.1.