"EnhanceMovie can deal with a range of common problems such as exposure, blurring, or lack of contrast."
PCWorld

EnhanceMovie > Filters > Denoise

Denoise

The Denoise filter detects noise in the video and removes it from the picture. It greatly increases the overall quality of video. Other very important function of this filter is removing noises that may appear after applying some video filters. For instance, the Brightness filter helps removing dark areas but may cause some noise (especially with settings close to maximum). The Denoiser filter solves this problem by removing any noise. For this reason, we recommend putting the Denoiser filter in the bottom of the list of filters.
Before:

After: