* added args for source image size and fourcc (23) …
* added optional mask blur (22) …
* replace background (21) …
* input source as context manager (20) …
* fixed mask not shown if not colored (19)
* added --internal-resolution and --output-stride (18) …
* reduced camera latency (17) …
* improve timing logging (16) …
* added simple virtual webcam support (15)