How to Blur Video Background in After Effects

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Here’s a step-by-step tutorial on How to Blur Video Background in After Effects:

1. Select ‘Composition’ from the menu
2. Click ‘Composition Settings’
3. Make sure the frame rate of your composition is the same as the Video
4. Click ‘OK’ to save the changes
5. Make a copy of the video the background of which you want to blur by selecting the Video Layer
6. Press ‘Ctrl+C’
7. Press ‘Ctrl+V’
8. Double-click the copy on top to open a new preview window
9. Select ‘Roto Brush Tool’ from the toolbar
10. Paint a selection over the objects you do not want to blur
11. Hold ‘alt’ while painting to subtract from the selection
12. To resize the brush, hold ‘ctrl+left click’ and drag the mouse up or down
13. Press ‘Space’ for playback and After Effects will create a selection for the subsequent frames
14. You can tweak the selection at any frame if the results are imperfect
15. Click the ‘Freeze’ button to cache the frames and remove the background
16. Switch back to the composition view
17. Select the bottom copy of the video
18. In the ‘Effects and Presets’ panel search ‘Gaussian Blur”
19. Double click on the effect “Gaussian Blur” to apply it to the selected layer
20. Adjust the amount of blur using the ‘Blurriness’ property

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This is how you can Blur Video Background in After Effects