First thing to check is the Device Manager on your computer. This step is required to be done to check if the drivers are properly installed on your computer. Go to Start > Run > devmgmt.msc. Make sure there are no yellow items in that list, then you can proceed further.
In case all webcams are installed properly, start JenausCam and use the drop down menu next to Video to select the streams. The camera devices have to be connected to PC for that menu to offer solutions.