The Product Gallery Widget has been introduced in version 2.5.0 of the Cloudinary WordPress plugin and can be used in 2 different ways:
Using the Cloudinary Gallery block
If you don't use WooCommerce, you can use the Cloudinary Gallery block when editing a post. You will be able to select the images you would like to add to the Gallery. Regarding the Gallery settings, you can customize your Gallery by going to the Gallery Settings tab under the Media Settings section.
Here is a video demonstrating how you can change your Gallery Settings and add a Cloudinary Gallery block:
Use the Cloudinary Product Gallery as the main WooCommerce Product Gallery
If you are already using WooCommerce, you might already have a view of your products. If you want to replace the WooCommerce Product Gallery with the Cloudinary one, you can go to the Gallery Settings tab under the Media Settings section and you will have a toggle to replace the WooCommerce Gallery. Note that this toggle appears only if you have WooCommerce installed.
Here is a short video showing how you can use the Cloudinary Gallery in WooCommerce: