Can someone share a basic example of mask pattern similar to Movement design?

Can someone share how an example of a mask pattern similar to the Movement design? Essentially I just want to see an example of how could do something to Movement where I have a mostly black background & any text or icon etc etc filling that renders any image behind the black.

https://services.garmin.com/appsLibraryBusinessServices_v0/rest/apps/1653693f-7231-46ef-8951-04d51e58b6d6/icon/1881ed23-9ae3-4f88-a885-42040b5ef70b