Sound front left after ignition In and roll on !?!?

Hello forum, I have a very funny problem with my Mazda 626 GF/GW Kombi 2,0 petrol. After I started the engine and started the first time, a funny hissing noise comes from the front left of the engine compartment. After that when driving and even after stopping at a traffic light or so nothing unusual is anymore. Now I tried to let the MAzda roll on with the ignition on. See also without the engine started this noise comes in. In the attachment a film with anrol Len. The cracking at the end is the handbrake, so has nothing to do with the noise. Does anyone have an idea what that can be? I’ve been doing this for quite a while and I mean it’s getting louder.