This is archive footage of local stonemasons on the island of Badija (Korcula archipelago). This location is nowadays a lovely shingle/pebble beach on Badija.
The footage is an excerpt from a TV documentary broadcast shot in 1967. Another footage from the same documentary is here.
The whole documentary is here: www.youtube.com/watch?v=F7aZTzhRPMQ
See more info about stonemasonry tradition around Korcula