rpi cam and motion

[DaWauZ]

I installed a rpi cam on board of the raspberry, and then installed motion, the description on the wiki is a little different, but OK I have installed it and added a dummy motion switch.
It did not work right out of the box, but I found I had to do this:

to load the model after each reboot, use this setting

sudo nano /etc/modules
enter bcm2835-v4l2
exist and save the fle
sudo reboot

And my dummy sensor is motion detection working.

But now, I can see in domoticz the camera image anymore, preview shows a cross.
Is there something wrong or how do I have to change it to get it working?