Port Screen capture and key logging application to MAC OS

We have two applications - both written in C/C++ (might be some python in there) which do screen capture and key logging on Windows OS platforms. We need to have these ported to run on Apple MAC operating systems. The screen capture works as follows: - Takes screen shots every X seconds (configurable) - Monitors for change in screen image to minimize the actual data captured - Compresses these to MPEG4 format - Transmits to server