Disabling processing in filter elelements

[Baby Octopus]

I need to dynamically enable or disable resize, say keep 1920x1080 as it is
or change it to 1280x720. 

1. Either remove this videoscale element from the pipeline
2. Just make the element passthrough from the application

Is not the second option easier?

I also see a usecase when use need to dynamically change color filter
elements such as gamma, change gamma from 1 to 1.2, and then bring it back
to 1
i. Why to have processing when gamma is set to 1? Ideally it should be a
passthrough
ii. To avoid this processing, you can simply make the element passthrough
than changing the pipeline



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