OBS game Screenshot capture Wrapper for C#

For a personal project, i need to make a screenshot capture software, i'm able to do this but the code doesn't work for games, where it only give a black screen. A Software called OBS, is able to correctly capture the stream of the game, so i need to create a c# project to make screenshot, using OBS code. So the work is: Build a wrapper library around the C++ OBS (Open Broadcaster Software - open source) DirectX/OpenGL game capture functionality to pull the screen grabs in real time into a buffer that can be safely accessed by managed C# code, converted to bitmaps etc. All DirectX/OpenGL modes supported by OBS should work. Completed project should be tested on multiple games using various DirectX and OpenGL versions. Completed project should be demostrable by saving a bitmap screen grab of the game in C# code once every second. Use the existing OBS screen hooking code, do not attempt to use another DLL injection based method. Regards.