How to make header background blur?

Hi, I want my design like a glass, have many element with background blur.
How do I make background blur?
I tried export SVG from Figma, but SGV does not support background blur.

please help me
Thank you

You can upload an image and in the image library, select the image and select ADJUST on the right.

The toggle the SHARPNESS tool to your liking

And then save the copy and insert as needed.