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1.) Download this Android tilt shift camera app.
2.) get Google cardboard.
Besides Snapseed, you can try out the Tilt-Shift Camera app that has gotten a lot better in last few updates.
Here you go
There's some apps that will process video... for tilt shift.
I installed this one: [link]
Seems nice so far, very easy to use. The app applies the filters in real time, so the preview is a bit laggy.