I've been on a pursuit of the best camouflaged trail cam I can have. My approach has been to decide on a tree in a location that I like and then take the bark from a downed tree of the same species. It gets dried and then glued onto my trail cams to help camouflage them. In my case, fir species are prevalent.
I think the end result is pretty good and it makes the trail cam nearly impossible to see unless you know its there. The Achilles Heel of a trail cam has always the strap. I've used thin bark that I staple to the strap once the trail cam is up. It's not ideal and doesn't always work to my liking.
I just recently came across two videos where the folks used 550 paracord. The light immediately went on in my torch-like, two-watt noggin...ding, ding Wiia...paracord comes in many colors and everything from solid colors to patterns to camo. I ordered several 50' lengths of paracord, some solid and some patterned, and am hopeful it will virtually disappear when mounting the trail on the tree.
One of the downfalls of paracord is that it is exceedingly thin compared to an inch-and-a-half strap. That means less material holding it tightly to the tree. I wasn't crazy how either of the two videos mounted their trail cams. I've decided to use a trucker's hitch to cinch it tightly around the tree. If anyone has another idea about how to affix it more tightly, I'm eager to hear it.
For what it's worth, the color choice of the paracord in this video is terrible, as is the knot-tying technique, but I'm sure it is just meant to give a visual idea of the difference between a trail cam strap and paracord. In this video's case, a color in the gray family, with a pattern to break up its outline, is something I would try.