How To Only Record When A Switch Is Flipped?

I have a customer who only wants the video from the DVR to record when a switch is flipped from a toggle switch they have mounted. My question is the DVR is recording the entire time now and they only want it to record when the switch is turned to the on position. Motion is out of the question because sometimes there is no movement when they flip the switch. Any help on this would be great.

I have a hidden camera attached to a toggle switch then run to a DVR is the current setup on it.

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