I got bored at the point where it clearly showed a recycling/waste plant and stopped watching. You can't feed livestock 100% plastic and have them live.

That said... they do feed pigs rotten produce and vegetables. It gets recycled from grocery stores/etc in bins. The stores get charged if they find too much plastic or non-edibles as they then just use it for compost. So is some plastic getting in? I'm sure it is. But nothing like what this video is showing. Not in the US anyway. With that much plastic the livestock wouldn't gain weight as well, and they'd lose money.