Yes. The DJI Osmo Pocket 3 can be used as a webcam. DJI says you can connect it to a computer through USB-C for file transfer or webcam use.
Can you keep it powered during a long webcam session?
Yes. DJI says Pocket 3 can be used while externally powered. The Handle With 1/4-inch Thread also moves the USB-C connection to the rear, which can make tripod-mounted powered use more practical.
Does the gimbal still matter on a desk?
The mechanical gimbal is not required to keep a stationary desk camera steady, but it can still be useful if you reposition the camera or use tracking features during a presentation or demonstration.
Can it replace a dedicated webcam?
That depends on your workflow. Pocket 3 adds a stabilized camera, standalone recorder, tracking features, and portable video capability. A simple fixed webcam may be easier if the device never leaves a desk.
See how to mount the Pocket 3 on a standard tripod.
See the Pocket 3 charging and battery guide.