Video LAN Client supports RTSP feeds. Just past the url...
rtsp://{USER}:{PASSWORD}@192.168.4.55:554/Streaming/Channels/101
This needs to be set up properly on each camera. Just log into the camera using a web browser and the RTSP username, password.
frigate,mqtt & home assistent - all share the same bridged network. The docker service name is the hostname to refer to. Don't use localhost...
HACS - https://hacs.xyz/docs/configuration/basic
Blueprint - https://www.home-assistant.io/docs/automation/using_blueprints/
- https://docs.frigate.video/guides/ha_notifications/