switch to MIT license
switch to LIVE_STREAM segmentation mode
add deque for holding masks to GreenCompositor
rename GreenCompositor prepare_mask to update_mask
re-organise operations on mask in update_mask
rename GreenCompositor blend member to blend_with_mask
add open, close, play and pause to VirtualSink
add open, close to CameraSource
delete start and stop from VirtualSink and CameraSource
add GPU build instructions
resize via opencv instead of mp
use in-place operations where possible