Hello,
I have watched the video you attached. Sorry Unfortunately, you couldn’t remove the hover effect and keep the gray-scale effect on the brands carousel. Because It requires customization and this is beyond our limitations and support policy.
However to remove the both you need to add the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.
.brands-hover-alt .brand-item img {
opacity: 1 !important;
-webkit-filter: none !important;
}
Note: It will remove the gray-scale filter effect and hover effect from the brands carousel
Best Regards.