At the start of the video you see a bunch of Mexicans sitting around with their children waiting to cross the border. Then a car arrives and some kind of old Mexican hippy with a bandana leaving the car- probably a cartell member that is in charge. Then the Mexicans start walking together and cross the border. Once they are in the U.S with their guitars they start dancing and singing "bamboleo". Probably a Mexican word for smoking Opium and beeing catholic.
Apparently there isn't a single border patrol officer in the video and neither a wall. Just shows how easy it is at the moment to cross the border.