Hey,
i do have set my IP cam that anyone can view the image (locally), just…to edit the settings i need to login.(Idea?)
The cgi thing in my url was a link i found in the manual of my camera.
For my basicUI usage (so not HABPanel) i have set 2 other stuff in my sitemap file:
For Openhab android app usage:
Video url="http://192.168.1.247/axis-cgi/mjpg/video.cgi" encoding="mjpeg"
and to use via the website:
Webview url="http://192.168.1.252/axis-cgi/mjpg/video.cgi?resolution=1024x768" icon=none height=22
I did a test in the meanwhile.
When i surf locally to my IP camera and richt click the image i am seeing, and use “copy image URL”…
I can put this specific URL in my HABpanel.
This will provide a livestream.
Though this wont work as long as you need to login before seeing anything.
Also found this on the TP-link website:
https://www.tp-link.com/uk/support/faq/2680/
Maybe there is a way to provide the login by URL.
i can not get something simular working for me 
so its hard to say
Maybe, this?:
https://community.openhab.org/t/ipcamera-new-ip-camera-binding/42771
Your cam has ONVIF i believe.