How to make you Videos brighter for the projector.

I was watching one of the Borgia series, the one from Australia, and it was just to dark for the projector, and I guess overall very dark to see. Finally at the end of the serie that I was watching, I found something at the very end that at least could do something about it. although somewhat to late, but it works pretty good, although some manual labor is needed.

There must be an video app that can do it on the fly in the app, but for now I found this solution with the Android app YouCut, although I guess you would do need to do it manual each one of the videos you wanna make brighter but it is possible at the very least if the video is 2 dark and help out of the projector for better watch ability :

https://www.youtube.com/watch?v=5T24G8iC_jk