We have a dedicated laboratory with very expensive and sensitive equipment. When handled incorrectly, they can cause serious harm to the user or others in the laboratory. Our department consists of 5 people who have access to this laboratory.
Therefore we introduced a couple of safety regulations (only supervised people are allowed to enter, entry-list with date/time, etc). As next step we wanted to install an surveillance camera. The camera is configured that it takes a photo if it detects movement and stores this photo 7 days. We also ordered the corresponding warning stickers that this area is under surveillance. There are no fixed workplaces inside the laboratory. Its plainly for manufacturing, testing and experiments. Everyone in our department has an separate workplace in an non-surveilled area.
We (our department, 5 persons) had a vote if we think this surveillance is ok. Only one guy voted against. He does not want to be surveilled when he works in this laboratory. Its the same guy that always leaves the laboratory like a mess. As we voted 4:1, we are now employing the surveillance measures. However, this guy causes a commotion, throws ramblings about DSGVO and that it is illegal.
Is this really illegal in Germany? It's a dedicated room, a critical area with special safety precautions and requirements. No one has an fixed workplace in this room. We use the photos taken by the surveillence camera only if something went wrong (i.e. accident, intrusion or messy laboratory).