Yes, it is possibe. this is quoted from Zoom:
The feature to join multiple meetings simultaneously from the Zoom desktop client allows participants to participate in or monitor multiple meetings at the same time. This is ideal for support staff who may need to monitor multiple meetings at the same time.
Once the setting is enabled, you can join multiple meetings by clicking on the join URL or navigating to https://zoom.us/join and entering the meeting ID. The Join button in the Zoom client will only work for the first meeting that you join.
