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boboweb I've done it, a few times (different methods / models over the last 1, 2 years). You can get pretty good results depending on your proces however processing a video takes about 10+ hours on my 4090 with like a 40minute 8k scene. It's too much of a hassle for me at the moment really. I'll wait when the models get faster or when SLR drive turns out to be a good easy solution.
Btw, your best bet at the moment is to first segment the video and then generate the alpha mask based on the segmentation (you have models that refine the rough segmentation in real good alpha masks). I believe someone on the eroscripts forum posted something like this some time ago too. Don't think there is any consumer solution that does this well at the moment though. But I haven't checked in a while.