A PIA Boeing 707 in early 1970s livery can be seen parked at the airport.
In another shot passengers can be seen disembarking from a PIA Boeing 707 or 720B in 1960s livery.
So apparently the video footage was made when PIA aircraft fleet was in the stage of receiving early 1970s livery.
In 1960s livery, there was a green color cheatline below the cabin window line like in following example photo of PIA Boeing 720B.

In early 1970s livery, green color cheatline covered cabin window line like in following example photo of PIA Boeing 720B.

Abbas