We used to recommend AbelCam but it seems that it has now been discontinued. I'm not familiar with any others so I hope you'll get some suggestions from other forum users!
Another potential solution is DeskCamera - we haven't tested this, but it looks like it has the feature you are describing. As an added bonus it supports ONVIF, so setup should be easy. In SecuritySpy you would enter the PC's IP address, select the ONVIF profile, and enter the authentication you set up in DeskCamera. Changing the "Input or stream number" setting should allow you to select between the PC's screen and its webcam. If you test this, please report back with your experiences.
Comments
We used to recommend AbelCam but it seems that it has now been discontinued. I'm not familiar with any others so I hope you'll get some suggestions from other forum users!
The AbelCam project has been terminated October 8th 2019
No download available.
Anyone else have ideas?
Another potential solution is DeskCamera - we haven't tested this, but it looks like it has the feature you are describing. As an added bonus it supports ONVIF, so setup should be easy. In SecuritySpy you would enter the PC's IP address, select the ONVIF profile, and enter the authentication you set up in DeskCamera. Changing the "Input or stream number" setting should allow you to select between the PC's screen and its webcam. If you test this, please report back with your experiences.