I was making the whole process complex. There is a very straight forward and simple answer. https://stackoverflow.com/questions/56813343/masking-out-a-specific-region-in-opencv-python This method creates a polygon that takes everything outside ROI and fills the polygon with black color.

In case others come across this question: I encountered the same problem on Centos 7. I also had –enable-optimizations but didn’t want to remove that flag. Updating my build dependencies and then re-running solved the problem. To do that I ran: In case the yum group is not available, you can also install the pacakges individually using:

Don’t forget to register your video activity in your manifest by setting android:supportsPictureInPicture to true:

Widgets like AnimatedOpacity and AnimatedPositioned can be used to achieve this. However, lifecycle of the children widgets in a ListView is a bit complex. They get destroyed and recreated according to the scroll position. If the child widget has an animation that starts on initialization, it will reanimate whenever the child gets visible to the UI. Here is my hacky solution. I used […]