Obviously the video you have posted here are actions of some misguided people not representing the excellence of Sufi's in Islam. If we were to count ignorance I'm sure i post several dance videos of people from ignorant sects ...who like to kiss george bush in the face. But the thing to keep in mind that ideocracy and stupidty does not have any bounds or limits and does not represent mainstream.
If one person prays incorrectly, it does not mean everyone is the same or we should stop praying, BUT rather you fix the bad apples and your good!
Anyways, here are authentic hadith on visiting graves for Eisal-e-sawab.:)
It is important to note that ad-Dahabi and Ibn Taymiyya have quoted this Hadith in their books which confirms that one can kiss the Grave and place his head on the Grave of Prophet Mohammad pbuh and Awliya Allah and request their mediation (Waseelah) after the death.
(13) It is in Hadith - Narrated by Ibn Majah, Ahmad, at-Tabarani, as-Subki and Ibn Asakir that : Mu`adh Ibn Jabal(رضئ اللہ تعالی عنہ) and Bilal (رضئ اللہ تعالی عنہ) came to the Grave of the Prophet(صلى الله عليه و آله وسلم) and sat weeping and Bilal (رضئ اللہ تعالی عنہ) rubbed his face against the Grave of Prophet(صلى الله عليه و آله وسلم). (Ibn Majah 2:1320, Ahmad, al-Tabarani, al-Subki, and Ibn Asakir).
The above Hadith confirms the fact that kissing of Graves and placing your head on the Graves is the tradition of Sahabah.
(14) It is in Hadith - Yahya (رضئ اللہ تعالی عنہ) related from Imam Maalik (رضئ اللہ تعالی عنہ) that he heard that AIi Ibn Abi Talib(رضئ اللہ تعالی عنہ) used to rest his head on Graves and lie on them [meaning holding the grave with his stretched hands while his head, entire face and chest is rested on the Grave]. Maalik (رضئ اللہ تعالی عنہ) said, "As far as we can see, it is only forbidden to sit on the Graves to relieve oneself." (Muatta' Imm Malik - Book #16, Hadith #16.11.34)