the multimeter will allow you to test if the fuse is functional or not. multimeter can test voltage, both DC and AC, amperage, resistance, and some models can test diodes.
you are using a 30 Amperes fuse!!! that means, that if something will happen to the camera circuit, the fuse will tolerate the increase in amperage upto 30 ams before it will burn, to protect the camera... however, your camera will probably draw 0.2 Amp of electricity, and it will burn before the fuse will try to save it. you need a more appropriate fuse, maybe 0.5 Amps or maybe 1.0 Amps... you might want to consider a fast burning fuse over a slow burning fuse - the fast burning fuse just blows the moment the amperage exceeds the nominal value, thus protecting sensetive electronics, slow fuse holds longer at the nominal and higher amperage, passing dangerous levels of electricity to the protected circuitry, before blowing... slow fuses are good for some electric motors that can take extra load for a few moments...

these are your fuse considerations...
and yes, your work is good...

Are you using a PIE video module or the BMW video module?