Pix looks like there is zero H or V sync.
No vert sync gives a vert blanking bar that floats either way but not lock in.
No H sync looks the same. Pix floats with a solid blanking bar.
Your vid shows the H freq barely off. You just cant lock it in for more than a few secs.
SO since its both look at the sync sep stage.
BTW manuals usually show TWO complete cycles of the frame or line.
A lot of modern scopes ( 70's +) have a TV-H & TV-V setting to make it easy !
73 Zeno
LFOD !