video voice editing

Hello freelancers! I have a few hours of video with some background noise. I tried to edit it only with Camtasia but I can't get good enough quality. I need someone who knows how to improve voice and knows several programs for such work. I will upload one sample file on freelancer. Download the attached video recording (.camrec file), apply your best editing skills to make sound as good as you can. Export edited video in your preferred format and attached it in your bid. Image doesn't need to be edited. You won't understand the language but that's doesn't matter for this job, I just want you to make the sound clear. Place a bid for editing 50 video files. Average video length is 6 - 8 min. Beside your bid attach edited sample file so I will see what you can do and what you can't. Bids and messages without attached file will be ignored. Thank you and good day!