grabAsync method
Grabs the next frame from video file or capturing device.
https://docs.opencv.org/4.x/d8/dfe/classcv_1_1VideoCapture.html#aa6480e6972ef4c00d74814ec841a2939
Implementation
Future<void> grabAsync() =>
cvRunAsync0((callback) => cvideoio.cv_VideoCapture_grab(ref, callback), (c) => c.complete());