What is you question here? Plenty of sites use animated images rather than video to demonstrate their product.

create GIFs to show common use cases that analytics users would actually expect like out of all the people that came to my website, how many of them signed up, or how many of them added something to the cart and did not buy etc. Add GIFs that showcase the dashboards from your product for these actions

Yeah man, we don't like .BMPs anymore.