Node or nodes which takes pictures with an ip camera with username and password each time when it have an request

It depends on what you camera supports. The brand I have support RTSP and with that you can use the live stream like this rtsp://84.27.12.000:554/user=admin&password=123456&channel=1&stream=0.sdp?
Note, the url is not for all the camera's the same. Read you manual or google for it.

Bart made a nice example in this topic how to capture 1 frame from the stream;

This works great for me.

And here is a discussion how to overlay text over your image; Overlay text onto image

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