You found the PERFECT piece of footage to use in your commercial.  
3 seconds of pure cinematic GOLD from some old VHS tape. 
Too bad no one has any idea who this person is - or how to contact them.

Let GOLicense be your Sherlock.
Even if we can't find it - we may be able to offer you indemnification.
That means you CAN use those 3 seconds of GOLD - without assuming risk.