Magewell USB Fusion HDMI & USB Video Capture Device - Manual (Page 15)

1. You have completed Connecting Devices .
2. Open the Zoom client and log in.
If not installed, you can go to Zoom website to download the software.
3. Select USB Fusion as the video input device.
i. In the upper right corner, click Settings , and then click the Video tab.
ii. On the Video tab, select USB Fusion USB-C or a similar name from
the Camera drop-down box.
The preview area will show the video output by USB Fusion.
4. Select USB Fusion as the audio input device.
i. On the Settings page, click the Audio tab.
ii. If you need to hear the speech from other meeting attendees on USB
Fusion, on the Audio tab page, select USB Fusion USB-C or a similar
name from the Speaker drop-down box.
You can click Test Speaker to test. You will hear the test audio if
everything works.
iii. If you need to send out the audio from USB Fusion, on the Audio tab
page, select USB Fusion USB-C or a similar name from the
Microphone drop-down box.
You can click Test MIC to test. Record your speech first and then play
it. If everything works, you will hear your speech.
After the settings are complete, Zoom will use USB Fusion for video
conferencing.
Before the meeting, make tests to ensure that the system runs properly. 
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