video caption works for what?

[ghost]

when i run
th videocaptioning.lua
it opens the laptop cam and then it closes it again instantly with this msg

/home/tam_g/torch/install/bin/luajit: videocaptioning.lua:73: must provide a model
stack traceback:
[C]: in function 'assert'
videocaptioning.lua:73: in main chunk
[C]: in function 'dofile'
...am_g/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: at 0x00406670
any idea how o solve this?