Found a working config for Hikvision at the end. The info on https://community.home-assistant.io/t/stream-component-confirmed-cameras-and-configurations/106729 did not work for me.
I have removed the username and password from the link, added as parameters and added authentication: digest.
camera:
- platform: generic
name: Outside
still_image_url: "http://<IP>/ISAPI/Streaming/channels/101/picture"
stream_source: "rtsp://<username>:<password>@<IP>:554"
username: "<username>"
password: "<password>"
authentication: digest