If you are looking for specific shaders to achieve a long-exposure look, these are the current community favorites:
Accumulate exactly (N) frames equally, then reset. Achievable in ReShade but consumes memory for (N) full buffers. reshade long exposure
For static scenes (waterfalls, clouds), you don't need to move. For (cars), you need objects to move through the frame while the camera is locked. If you are looking for specific shaders to