Wow, that video just shows people climbing up and over the walls, with what I'm assuming American police officers/soldiers just sitting by and watching?
Why not, like stated above, set up sniper posts, like every mile or whatnot, and if someone is seen coming over the fence, firing a warning shot into the fence, and if that's still not heeded, shot to kill. I doubt that this type of thing would continue long term, as I'm sure its effects would be immediately noticeable.