Hello,
I am a C/C++ systems engineer and offer interfacing/systems integration assistance to help call C/C++ DLLs from Delphi, Pascal, VB, C# etc. (and vice versa).
You can import simple C++ DLLs using certain Delphi keywords, but INPUT parameter marshalling will need to be done, so that the data types in C/C++ function calls and their input parameters, match their equivalent Delphi data types.
UPDATE: as discussed in chat, SDK is complex , to simply be called from Delphi. Paramaters need to be marshalled, OR a wrapper DLL created, around the .LIB and then called from Delphi. Will take a lot of time; most likely a man-week, if not, two man-weeks(80 man hours), including testing and delivery.