Yes, dogs are famously unable to get over “high” fences.
I LOLed at the video. Ok, you have a black dog and a white dog, and they’re both blurry, but the background is light so the white dog washes out more. It’s amazing how many “ghosts” captured on video are the result of bad quality video cameras…
Something tells me the “high” fence in this case is even less than 6 feet…