Your wife has an 80D!?!
Thats a brand spanking new DSLR with fantastic video capabilities.
Just use that.
In MP4 it will shoot 60 FPS at 1920X1080 res.
Its not a 4K camera, but as far as low light goes, you have options. Expensive options.
Typical video cameras come with small sensors that perform poorly in low light.
The DSLR option gives you better low light performance, but a lower range of options.
Typically video cameras come with 20X zoom lenses, and features that allow for smooth operation and audio options.
Typically DSLR cameras must be manually zoomed with a lens that has a focal length range. Not as smooth, nor as much range.
To get to 20X you would have to have a very large 800mm lens on the DSLR. Very expensive.
So, to try to compare them is not really doable.
Video cameras are great for video, its what they do. DSLR cameras can do video, but they don't often has the options and ranges of video cameras.