We require no specific resolution, although we generally recommend a resolution of no less than 720p.  You may of course use higher resolutions. 

We have seen great results with even lower resolutions, especially if the recorded motion is relatively simple, with good lighting, contrast and possibly a high fps rate.

If you are using RADiCAL’s Motion App, the resolution is automatically set and fixed during the recording, so you don’t have to worry about it.