Compression does magic. I recorded a video of my daughter's highschool graduation yesterday, the camera gave me a 1280x720 Quicktime .MOV file of 500 MB approximately for around 2+ minutes of footage. There's a lot of darkness in that particular shot, except when she's walking across the stage but because of the otherwise dark areas there's a lot of graininess, and hence pixel noise, and at high bitrate or quality that results in a very large file no matter what compressor you use if you want to keep track of all or most changing pixels. So I reduced it to 640x360 to get a bit of color averaging between 2x2 neighboring pixels, and also made the whole thing brighter and higher contrast, and got rid of much of the noise. The size is now about  7 MB using H.264 codec  in a .MP4 or .MOV file.