As-salaamu `alaykum
That video is very doubtful in the least, and I would go as far as saying it is baatil (false) with firm conviction. Just because people venerate these graves and make such claims, it doesn't make them truthful. There is dispute about the death of many individuals, and you find for example, the people of innovation setting up a "grave" for this person in one country, and then another grave for the same person in another? The shi`a and soofees are professionals at this, following none other than the Jews and Christians. The only Prophet's grave that we're certain about is that of our Prophet Muhammad, sall-Allaahu `alayhi wasallam.