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If you do not have a spot monitor output than you will need a video multiplexer seen herehttps://www.cctvcamerapros.com/CCTV-Video-Multiplexers-s/76.htm
You will need to split the video signal from each of the eight cameras you would like the employee to view. You split the signal so that you can run into the DVR and the multiplexer on each of the eight cameras.
Please let me know if you have any questions.