Energy generated by bicycle to the shredder

hello , I want to try to change the engine, power generated by bicycle.
mayapedal.org and basing on this project.
http://bicihome.com/inventan-una-bicicleta-que-recicla-el-plastico-y-que-puedes-construir-tu-mismo/
My questions are about the power it can generate.
and if it can be adapted to the machine preciousplastic .
we’ll see !