Kozkat: Trail cameras will not work for what you wish to do. Any movement of grass, leaves etc. caused by a slight breeze will cause the camera to trigger.
What will work is a game finder which hunters used for freshly downed game. These work by detecting body heat. If you do a search for either: Aimshot Heatseeker Game Locator-you tube or http://game-finder.com
Seeing the video on the first one, looks pretty impressive and much better than the second. I have the second one "Model A". which was purchased many years ago and it does work. The one shown in the video has higher technology. If in your case, you had someone walk ahead of you, this may help. Good luck.