If meta data LUN is totaly destroied , is there any way to rebuild the data from the video LUN

What happened to your metadata? Are you sure the metadata is gone?

In theory, file carving could be attempted on the data LUNs, but you would need a tool that understands how Xsan lays out data across LUNs in a stripe group and hope your fragmentation isn't too bad. I doubt such a tool exists, but if one does it almost certainly is not publicly available. You should probably contact a data recovery service with experience recovering data from Xsan. Do that before you do anything else if this data is really important.