the technique described in the video uses the Background Blur of Adobe XD – this effect is not available in InDesign.
You could either use
– Illustrator (Effect -> Blur filters) and place your .ai file inside ID,
– Photoshop (Filters -> Blur) and place .psd,
– export a PDF out of XD using this effect (I don't think you can place .xd files nativly in ID?), this technique has the disadvantage that you can't quickly edit the effect and resave, you always have to export a PDF.
Thank you for your workflow alternatives. I am going to put a feature request for blurring for InDesign.
Why for this particilar effect when you can "round trip" between InDesign and Photoshop and have access to scores of all kinds of effects – horses for courses.
The workflow is to use the correct tool for the job.
InDesign is used for assembling assets. So for creating effects to photographs you use Photoshop and then Place the PSD (in RGB color mode) in InDesign where you add text and possible other images (which may be created from other applications, such as Illustrator).
You will also need to consider the final output(s); is it for print or for digital and if so which format(s).