With respect,
I agree with Karyn. What wasn't mentioned, but is easy to infer, is that the digital video was shot at 24fps progressive scan.
The question I had was whether the camera used a rolling shutter or a "global shutter".
The shallow depth of field suggests that the camera has a large image sensor so it's either a DSLR or one of the nice new large format video cameras.
The examples shown are
24hz synced to the frame rate.
23hz creates the forward movement effect
25hz creates the reverse effect
The issue about the shutter technology would concern some nuance of how the sync effect appears but the general premise that there is a sync point and a less than, and greater than frame rate that creates the effect, the premise that Karyn put forth, is a correct explanation.
best regards,
mike