Pause and resume live video with latest frames without affecting the sink

[vk_gst]

So, is it possible to pause a specific element like 'v4l2src' instead of the
whole pipeline? 
I tried putting a  'valve' element after  'queue' and set the property 'drop
= true' with a timeout. 
But I did not see any video from the start itself. 

How would I pause the video in this case, and still allow effects from
gltransformation be applied on the paused frame after the video pause? 



Regards



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