VidiReports is not a multi-core application per see (i.e. images are not split across multiple cores).
However, VidiReports can use multithreading to process images in parallel, with the nthreads parameter, if you have processor using 2 or more cores. This will result in better FPS, or will let you use higher resolution images. Note that if you have just 2 cores and use the dual thread option, you won't be able to run any other app smoothly in parallel to VidiReports.
To implement this feature, edit the value nthreads in your VidiReports Control Center:
Click on the Configure button, then on the Advanced parameters dropdown. In the "Main Parameters" section, locate the "CPU cores dedicated to Vidireports and enter value between 1 and 4, but lesser or equal to your maximum number of threads.
Be aware that the current maximum value supported by VidiReports is 4 - f you enter a value that's equivalent to your total number of cores (eg if you enter 4 while you run a quad-core processor), then no other app will be able to run simultaneously to VidiReports