Shodan simply indexes open ports. If the software is running on port 8080 (the default for WebcamXP) and has no authentication, Shodan indexes the feed as "open."
If you must expose WebcamXP 5 to the internet (not recommended), follow this checklist: webcamxp 5 shodan search install
Using Shodan, you can specifically filter for these devices. webcamxp+5 - Shodan Search Shodan simply indexes open ports