I've been very impressed with this plug in.
I've been adding this effect like all my videos and gave me great results.
Magic bullet Denoiser seems to work great as well but it didn't please me due to its limits.
Neat video can be used for many softwares. Premiere, after effects, vegas, avid, you name it.
This plug-in is not free but it really worth your money.
In this video, I didn't cover the basics so if you want to learn more about Neat video, go check out their website.
For the footage I showed you, it was shot on a 5d. I was amazed due to its low light sensitivity but still gave the digital noise which is not terrible but not pleasing to look at.