Hi, i'm a web developer and sysadmin, I have installed and configured many ip cameras in the past.
Unfortunately, every camera is different, many of them uses a rtsp streams, but as so few of them uses a really standard encoding an method of authentication, it can be tricky to archive a livestream-like funcionality. However, there are many ways of displaying the images of the ip cameras to the public, it should be no problem to visualize the video in another format (if the camera supports it), or simply took a picture every second to archieve a video-like representation in your site.
I would like to know the camera model, details about yous hosting service (for your wp), and the video quality you expect to archieve.