If you have Embedded Coder product, then you can use Static Code Metrics tab in the compilation report - you should be able to see stack size for each function in there.
To check the actual run-time memory usage (heap memory usage), I think there is no intrinsic way of doing that in MATLAB Coder itself. You can use some third-party tool that works with the generated C++ coder, such as valgrind massif, or VTune, or something like that.
