feat: blur with new av

[tlebon]

Description

create blur effect for calling

Screenshots/Screencast (for UI changes)

Checklist

• [ ] PR has been self reviewed by the author;
• [ ] Hard-to-understand areas of the code have been commented;
• [ ] If it is a core feature, unit tests have been added;

Important details for the reviewers

(Delete this section if unnecessary)

• use (x) data
• can be reviewed commit-by-commit
• be sure to look at ...