What kind of video is this? LabVIEW has no video indicator so you would most likely need to use a third-party control. On Windows this would be an ActiveX control. Your best bet is to get one to which you simply provide a URL and it can grab the stream that way. I think the Windows Media Player ActiveX control should be able to handle that.
If you're getting video from a USB camera or something, then see
this thread.
You can check the LabVIEW documentation on how to use ActiveX controls with LabVIEW, and there's plenty of examples on this forum as well as a few that ship with LabVIEW (Help -> Find Examples).