well after some work .... i have edited a currently existing video filter .... it works fine and according to the changes .. no issues.
Then i added the edited version of the filter and made it a new filter .... compiled sucessfully ...
I then edited the ui files "video_effects" to get the checkbox for the filter and placement etc.
I am now struck on how to finally attach the action on the check box to the call of the video filter.
Its beginner stuff .... little bit of hint please.
thank you.