the android api tells to open a cam=   open(int cameraID)
according to the ketaisource:              camera = Camera.open(cameraID);
hm…what is cameraID  ?
here it is in sources:
void setCameraID(int _id) {
        if (_id < Camera.getNumberOfCameras())
            cameraID = _id;………………


So if you declare:

1. import ketai.camera.*;
2. KetaiCamera cam;

in setup you could switch to camera 0 or 1 with= 

1.   cam.setCameraID(1);