Demo...

• faded demo

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better performing...

• css3 filter animation 1920x1080 Blur by amount 40
• css3 filter animation 1920x1080 Blur by amount 80
• css3 filter animation 3840x1080 Blur by amount 80

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not as good...

• Blur 2032x1391 Blur by amount 40
• Blur 2032x1391 Blur by amount 80
• Blur 1920x1080 Blur by amount 40
• Blur 300 x 169 by amount 40 on top of higher res (idk why this is wierd_
• WEbGl Blur 1920x1080 Blur by amount 40
• just fading a blurred image on top 1920x1080
• just fading a blurred image on top 3840x1080