I had remapped my capslock to the hyper key as mod3 using xmodmap. Here is the result of xmodmap
shift Shift_L (0x32), Shift_R (0x3e)
lock
control Control_L (0x25), Control_R (0x69)
mod1 Alt_L (0x40), Alt_R (0x6c), Meta_L (0xcd)
mod2 Num_Lock (0x4d)
mod3 Hyper_L (0x42), Hyper_L (0xcf)
mod4 Super_L (0x85), Super_R (0x86), Super_L (0xce)
mod5 ISO_Level3_Shift (0x5c), Mode_switch (0xcb)
So is it possible to remap this mod3 key in vim as a leader.