Add voice over to 2 powerpoint presentations and convert to video

I have two powerpoint presentations about gunsmithing schools for which I need someone to add a voice over and convert them to video for upload into youtube and various websites. The presentations are ready and have about 150-200 words in them each and will only be 2-3 min long at most. The script is already on the slides and you simply need to narrate the words on the slides and then convert the result to a high quality video (mp4 format). You need to be able to provide a male voice over with North American accent (native speaker). I need an older, mature voice. Please provide examples of previous work / references.