1. The Native SwiftUI way:

Just add .blur() modifier on anything you need to be blurry like:

Image("BG")
   .blur(radius: 20)

_{Note the top and bottom of the view}

Note that you can Group multiple views and blur them together.

2. The Visual Effect View:

You can bring the prefect UIVisualEffectView from the UIKit:

VisualEffectView(effect: UIBlurEffect(style: .dark))

With this tiny struct:

struct VisualEffectView: UIViewRepresentable {
    var effect: UIVisualEffect?
    func makeUIView(context: UIViewRepresentableContext<Self>) -> UIVisualEffectView { UIVisualEffectView() }
    func updateUIView(_ uiView: UIVisualEffectView, context: UIViewRepresentableContext<Self>) { uiView.effect = effect }
}

3. iOS 15: Materials

You can use iOS predefined materials with one line code:

.background(.ultraThinMaterial)