As long as you insert the filters upright into the filter holder and they are not thicker than 2 mm, they will fit.  

For the Nikon 7200 you need a filter in the size 67 mm, this also applies to all lenses. 

hello , you could combine two(77-72,72-67) 

Yes, I believe you can with any trail cam. There are several videos on YouTube. You need a 4.0x1.7mm plug. I saw one video that explains a direct hard wire. After watching some videos, I decided it was easier and about the same price to buy the Stealth Cam 12v external battery pack with solar panel. I paid $50 at Academy Sports online. Plus the 4.0x1.7mm plug from Amazon. But if you like to make things, there are plenty of videos on making your own solar battery packs. 

7.4mm