The video captures the moments before the Cuomo employee attack

Exclusive video obtained by The Post shows the moment immediately before an employee of Governor Andrew Cuomo was hit on the head by a homeless person in broad daylight in Manhattan.

The scary images show the man sneaking up behind unsuspecting 51-year-old Lisa Cavanaugh as she walks down Third Avenue near East 48th Street at about 2:15 pm on Christmas Eve.

At one point, the suspect, identified by police officers as Christopher Guzman, 28, appears to reach Cavanaugh and walk next to her for a second – while carrying a large concrete block.

The attacker then falls behind Cavanaugh again before lifting the piece of concrete over his head and suddenly running towards her out of nowhere, hitting her on the head and temporarily knocking her out.

Cuomo’s employee, who helps with recruiting and appointments to the governor’s office, needed stitches to close the wound two inches deep in his head. She suffered non-fatal injuries, the sources said.

Guzman – who told police he lives in a homeless shelter on West 35th Street in Manhattan – was arrested and charged with second degree assault in the terrible attack.

Cavanaugh is believed to have been returning home from work at the time of the attack, which took place in front of a construction site. Cuomo’s Manhattan office is about six blocks away.