Allow passing of ffmpeg parameters for video decoding.

I'd like to be able to pass parameters for decoding video files to the ffmpeg backend. According to this post, https://forum.qt.io/topic/155683/passing-parameters-to-ffmpeg-while-using-qtmultimedia, the option is not available. Is this the case? alternatively is there a way to pass hardware preference (specifically to assign video decoding to specific device - normally done on ffmpeg like this `ffmpeg -hwaccel cuda -hwaccel_device 0 -i video.mp4`)?