Hi
You would have to compile the desired camera drivers as a module for the mipsel kernel, in some way. I think this needs some more intensive tweaking of the configure scripts of the drivers or there integration into the kernel source tree of the development system. i tryed to do this with the Drivers for some ultra-lowcost sunplus chipsets, but endet up seeing the driver supported the cam only very ugly (incorrect shutter controll). You may check first on a normal linux box that the driver works well with the cam...
Greets
My Stuff: WL-500g, Mapower H31x 10GB HD, Philips Webcam Vesta PRO, TerraTec Webcam PRO, USB Hub