This gadget is really helpful to rec and stop video or taking a photo handsfree. 
I've adapted Bluetooth Shutter Switch into a foot switch box.

So you may Rec and pause (or stop) your video or take a photo handsfree.

You need only below items some cables, rocker switch (can be harwest easily from old electronics) and a battery holder.
https://www.amazon.com/dp/B08L48WD4W
https://www.amazon.com/dp/B0BJ1JFBMM

Kevin NGAI

https://www.signalhk.com