Huacam is a maker of inexpensive cameras in Hong Kong, primarily sold on Amazon. For details, see Huacam's official web page.
RTSP streaming from the HCV724 works in VLC with:
However, RTSP streaming from this camera does not appear to work in ZoneMinder.
HTTP streaming may work by some form of this URL:
However, this current returns "Preferred Video Codec invalid", so this is also unusable with ZoneMinder.
It has been reported that some Huacam cameras are supported using the camera as an ffmpeg source with the following path:
rtsp://<IPADDRESS>:554 -rtsp_transport tcp
However that does not appear to work with the HCV724.