Kodi and LibreELEC were not designed for surveillance cameras. There are better, more dedicated software solutions for video surveillance.
AFAIK, webcams will need to be UVCvideo compatible.
Connection to your WLAN cam failed, google "failed to initiate sched scan". Try with LAN cable.
You could also try a full-OS Linux solution like Ubuntu. It should have more hardware drivers available.
So how many cameras are you planning on using?
Yeah, this is the wrong spot to ask for working cams. 
Better switch to a Raspbian forum.
I'm not angry. As a moderator I know that very few users connect a cam. I just gave you a good hint to solve the problem.
You could also try a full-OS Linux solution like Ubuntu. It should have more hardware drivers available.
So how many cameras are you planning on using?
Consider the following scenario: A secondary house that is empty for a long time, only occupied a few months a year or weekends.
Would you leave an Ubuntu PC to handle the surveillance cameras so it can be stolen? Excuse me, I'm thinking of leaving a € 25 TV Box with LE or CE to manage the surveillance cameras and send the recordings to the main house. In this way, in case of theft or occupation of the house you will always have the recordings and if the TV Box is stolen you only lost € 25.
So far I have not done anything related to this matter, and this is because LE / CE do not provide facilities for it. I am obviously dismissing the alternative of paying a monthly surveillance fee.
Consider the following scenario: A secondary house that is empty for a long time, only occupied a few months a year or weekends.
An empty house should have a better warning/alarm system than just one or two cameras IMHO.
Or is it okay that in case of fire, you can watch your secondary burn to the ground?
OP's solution is for an old(er) relative to watch 2 camera angles. Again I say there are better solutions than Kodi to run a webcam solution. If you want to secure your property that's worth some $100,000 or more, would you really rely on a $25 webcam/computer package?
An empty house should have a better warning/alarm system than just one or two cameras IMHO.
I'm not really worried about the building, the possibility that the brick walls with reinforced concrete structure, or grounds being stolen is very remote 
. Right now I am only relying on insurance and notices from the police and neighbors, but what worries me most are the occupations of buildings, which in my country is a real plague. For this I would only need a camera inside the house.
Considering that LE / CE is not helping with this, the alternative I see is the installation of a network camera with distant ftp recording using a VPN client in LE / CE for recordings in the main house.
Hi,
OP's solution is for an old(er) relative to watch 2 camera angles. Again I say there are better solutions than Kodi to run a webcam solution.
Surely there is, but we live in different realitys. I don't have much money, infrastructure and knowledge to do it. Besides this all stuff needs to be imported (= long time to wait + taxes).
Another possibility:
This resource is compatible with Libreelec in RPi? External players
I didn't try it yet, I'm far from installation now, but reading about I found someone telling that .xml in wiki is incorrect for vlc in linux systems.
So, if it works, someone knows correct spelling of that file?
Thks
There is also DietPi. It's a mash-up of lots of different progs, tools, services, including Kodi as well as webcam stuff (as separate solutions).
It's quite a handful to configure, but perhaps you can use it as a webcam solution.
... can see it streams (rtsp://192.168.0.14:554/11 or /12) in vlc or ie + fp in a win computer normally.
When i try it in kodi 18.9 + Rpi4 2Gb , got nothing. I tryed with add-on surveillance cameras and with a strm file ...
These last few days I have been studying how to use, see, and record, from an IP camera accessible from LibreELEC. As I did not know everything, I have been looking for docker services, and almost none can work on small devices with an arm processor, and those that work as kerberos do not allow continuous recordings, they only allow recordings by motion detection through software, which leads to the use of CPU and impermissible heating. In the end I have not found any practical and usable software so I have had to make one that can work with any CPU.
The commands are:
#!/bin/sh
# cam recording script /storage/.config/camrecord.sh
find /storage/shared/Cameras/cam0 -name "*.mkv" -type f -mtime +7 -exec rm -f {} \;
while true
do
sleep 10s
/storage/.kodi/addons/tools.ffmpeg-tools/bin/ffmpeg \
-nostats -nostdin -rtsp_transport tcp \
-xerror -ss 0 -stimeout 3000000 \
-i "rtsp://admin:@192.168.0.200" \
-c copy -map 0 -f segment -strftime 1 \
-segment_time 1800 -segment_format mkv \
/storage/shared/Cameras/cam0/cam0_%Y%m%d_%H%M%S.mkv
doneWith all this, the workload of the remote arm recording device and of the x86_64 LibreELEC server, are very small.
Obviously seeing the image of the IP camera in real time is very easy, you can use the Surveillance Cameras addon or add it to your list of TV channels. For me it is more practical to do it with my smartphone and VLC.
Hope my solution gives you ideas on how to solve your problem.
I would just like to mention when FFmpeg Tools 9.80.11.114 Add-on is installed in LE 10, the path to ffmpeg is /storage/.kodi/addons/tools.ffmpeg-tools/bin/ffmpeg
I think the main issue was that he couldn't get the camera stream to work from LE..