The video clearly shows that there really were the floating stones which made bridged up the gap between india and srilanka. the stones still float in ater. they are REAL.

A 'floating stone' of Ram Sethu, the bridge mentioned in Ramayana epic, brought to Patna from Rameshwaram as an evidence to the existence of Rama and the bridge built for him to cross over to Lanka is attracting thousands of devotees everyday. This 'floating stone' presently exhibited on the first floor of Mahavir Mandir is reportedly one of the stones that got scattered at Rameshwaram during Tsunami and similar cyclones. The visitors or devotees so to say, are amazed at the amazing stone. Following is the link to the video showing the floating stone.
Mysterious floating stone.