They are praying, chanting and one person blows a shofar:
However, at least one Arabic article, even after linking to the video, describes a much different - and quite unlikely - scene:
Among the rituals of the ceremony, to be held at the tomb, are practices to drink alcohol [or spilled over the cemetery and licked after that - not sure what that means - EoZ] , and the slaughter of sacrifices are often sheep or pigs, and dance hysterically to some Jewish tunes and say prayers and entreaties to cry bitterly in front of the grave, and hit heads in the Wailing Wall for the blessing.Yeah, let's slaughter and sacrifice pigs at a famous rabbi's tomb!
There is also a group of Egyptian bloggers who are very much against the annual visit.