If you slow the vids right down the cpu/gpu seems pretty reasonable, at least on my rig. I run that vid on 2 x 4k monitors, one in landscape, one in portrait.

With all windows minimised, and maximum rendering going on at 0.25% speed, there's 4% GPU usage on each DSHost process, CPU usage shows 0.1% on each process. Running at 2x speed, GPU goes up to about 30% each process, cpu is about 6% each process, so definitely a lot more resource hungry when sped up. But those figures also drop to zero when you're doing anything in fullscreen or with a maximised window if you've configured DeskScapes to pause under those conditions.

I have a RTX 3070 and an i9 10900kf with about 40% overclock on the processor (5ghz), but as you can see it's going to punch your GPU a lot more than your processor, as long as your GPU can do dedicated video decoding...