Motion doesn't detected my webcam : UNABLE TO OPEN VIDEO DEVICE

I would use a USB webcam with Motion software, installed in Ubuntu on my Windows PC (WSL2 ) But when I started Motion as a service and i check on browser at the address [LOCALHOLST:port 8080 or 8081 ] it appears the Motion interface but never has been detected my webcam. Always It is showed a gray screen, for the MyCam1 option, with written at the top on the left "UNABLE TO OPEN VIDEO DEVICE". I tried many types of configurations in the camera1-dist.conf and motion.conf files, but unfortunately they still doesn't work Someone who could suggest me what type of configurations and in wich file, do I have to use to detected a USB webcam with Motion software ? Thank you in advance. Hi, many thanks your indications has been very useful! I have followed all the steps and I have attached the webcam to my Ubuntu distribution and now Ubuntu 'lsusb' comand gives the following output root@LAPTOP-5OFK2AK7:/home/daniele# lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 3443:950a SHENZHEN AONI ELECTRONIC CO.,LTD NexiGo N950P 4K Webcam Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Unfortunately it still doesn't work..Motion still showes a grey screen and the UNABLE TO OPEN VIDEO DEVICE.. I think now the problem is in the camera1-dist.conf file. I'd like to set the webcam in localhost:8080 (port) or ( 8081 ) but i don't understand, it still doesn't work what and where I have to write in this camera1-dist.conf file # This config file was generated by motion 4.2.2 ########################################################### # Configuration options specific to camera 1 ############################################################ # User defined name for the camera. camera_name MyCam1 # Numeric identifier for the camera. camera_id 101 # The full URL of the network camera stream. netcam_url http://127.0.0.1:8080 # Image width in pixels. width 1280 # Image height in pixels. height 720 # Text to be overlayed in the lower left corner of images text_left CAMERA 1 # File name(without extension) for movies relative to target directory movie_filename CAM01_%t-%v-%Y%m%d%H%M%S