Sometimes in low light my auto mode sets my ISO to 3200 with a lot of noise. I go to manual to adjust this to 1600 so it has less noise. If I reduce it to 800 to avoid even more noise, is it posssible to do anything to compensate for the dark videos? Or should I keep it at 1600?

What device are you using?
Usually the small sensors are not very good in low light situations.

In general there are 4 things you can do about the amount of light you get on your sensor:
- Use low shutter speeds (causes some image blur so it's a trade off between noise and blur)
- Shoot with 25 or 30 fps as it allows for slower shutter speeds.
- Use smallest f-stop (large aperture) if possible
- Increase ISO (more noise).
To do this, shoot in full manual mode if available.
If not: the camera will usually choose a lower shutter speed and large aperture already.

Good luck with your tries!

Thanks for Montfrooij's input, great suggestions, please refer to that to have a try.

Thanks Montfrooij! I'm using the Osmo+. Isn't the aperture fixed on it? Or can I alter it in any way?