Thats not a video signal of anything I had seen.

Maybe its not a video signal at all. Could be a proprietary signal for maybe Sync? who knows... what is the duty cycle/period of the oscillation? Could give clues as if this is a sync pulse.

Hard to tell from your picture, but it appears the period is 120ns. That is roughly 8.33Mhz. System clock freq? hmm.... Could be encoded/modulated, and not clean video persay.