Hello,
Cisco SX20 have available DVI input interface for PC presentation or from any external video source. Usually handy cams have the HDMI or mini-HDMI out and you can take the signal from there and connect it to the DVI input of the SX20 using a HDMI/mini-HDMI to DVI cable. Note that the SX20 DVI input accepts maximum video resolution up to 1920x1080 @ 60 fps.
![connect.png connect.png](https://community.cisco.com/t5/image/serverpage/image-id/24447i96CD374A66D5CBCA/image-size/large?v=v2&px=999)
regards,
Ace