You can apply a develop preset to one or more videos using the Quick Develop panel on the right side of Library:
You can also apply basic adjustments to exposure and white balance.
But beware that video in LR has never been well-supported by Adobe. Many people complain about frequent bugs, stuttering playback, inability to correctly import basic metadata like capture date, lack of support for common codecs (e.g. HEVC/H.265 on Windows), lack of basic features such as rotating videos, and limited abilities to export into other formats.
Thank you for this post! I just got the paid version 3.4 and my screen doesn't look like the screenshot here. I don't even see a library option at the top of my screen. I would like to be able to add the bright preset that came with my app to my videos as well. Thank you in advance!
"I just got the paid version 3.4 and my screen doesn't look like the screenshot here. I don't even see a library option at the top of my screen."
Sounds like you're using the cloudy version of Lightroom, not the traditional folders-based Lightroom Classic. (Shame on Adobe for such confusing product names.) But you've posted in the forum for Lightroom Classic -- if you repost in the cloudy Lightroom forum, you'll likely get an answer quickly: