Here is how you can use OBS virtual Camera and DeepLiveCam with WhatsApp Desktop. First, make sure you have already installed and linked your number with WhatsApp, and installed the OBS Studio.

Now, with new updates from WhatsApp, the OBS virtual cameras are not shown in the drop-down list on WhatsApp Desktop. Thus, for this, we will need to use another plugin. Simply download the Droidcam from the provided link and install it on your computer. Now, open OBS Studio. Go to Tools and then DroidCam Virtual Output, and click on Active. Make sure this is active. After this is done, your WhatsApp will detect the DroirdCamera and you can use OBS with WhatsApp.

To use DeepLiveCam on the WhatsApp Desktop. Simply open the DeepLiveCam. Select the photo and select camera, choose Integrated camera, and click on Live. Now open OBS Studio, click on this plus icon at the bottom, and choose Windows Capture. Give any name you want, and click OK. Now choose the preview, which is python.exe preview. You will see the DeepLiveCam video preview there. Adjust the video size accordingly. Then go to Tools to DroidCam Virtual Output and make sure you activate it. Now open WhatsApp, go to Settings → Video and Voice, and you can see the DeepLiveCam video. Now, if you video call anyone, this video will be shown.

Hope this video was useful. Thank you very much.