The second approach would be to export your sequence to a full resolution TIF sequence. It does a terrific job but is painfully slow. One would be to use a plugin called denoiser by MagicBullet, which you have to buy. The titles are in German, but the links in the first tile on the left side might still be helpful to you. A while ago, I assorted some Tutorials on several techniques in Blender, you can find it here. You might find some more on the Blender.SE or through other sources. There are also some tricks and workarounds that can help with that, here's an article detailing some of them. There are several other settings that can affect the occurance of fireflies, but some of them are well-hidden. This will correlate directly with rendering times. The easiest way to reduce fireflies is to increase the number of samples the program runs during export. A while ago, I exported a 15-second sequence at 1000 samples and 24 frames per second rendered for three days straight on my laptop.
There are several ways to reduce fireflies, however depending on your settings and available hardware render times will become extremely long.
artifacts that stem from the nature of the Cycles Engine in Blender which is based on ray-tracing. The noise in your example image looks like fireflies, i.e. If you have enough computation capacity, this will be a superior solution since post-denoising will always introduce some amount of blurriness into your video. As an alternative to the denoising method suggested by you could try to export the scene from Blender with less noise.
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