Hi,
My name is Milan. I am music producer and mixing and mastering engineer.
The issue that you're having is quite common in audio recording.
It seems that the audio needs to be extracted from video, then applying some de-essing, de-click and de-pop will solve this problem.
This is a standard practice in working with audio files, especially with voice recordings.
I could do this for you in one day, and also apply some additional enhancements and processing to the sound to improve the quality of your audio recording.
I also need one more day to bring audio back to video and to sync the files.
It would be helpful to know what video format you need (MP4/3GP/MPG/AVI/WMV/FLV/SWF).