How to use motion sketch with live video footage?

[Gary Sweeney]

I want to be able to use motion sketch while the video plays.
For now when you click ‘Start Capture’ the video stays on the current frame but the ‘Current Time Indicator’ moves along the timeline and normal speed.
Is it possible to do the capture while the video plays in the background?
 
I have tried ticking the background option with the same results.
 
* Using After Effects 2020 17.0.0 on Mojave