"Merseyside Police specifically asked people not to share footage ... So ... you won't find that same footage in the national press because of contempt of court laws."
"Won't find" means you think there is no way the press can use the footage while the police request is in effect. This is not at all true. Contempt of court laws apply regardless of what the police say. It's contempt of court, not contempt of police. A press decision on whether to show footage depends on their editorial standards and their own legal counsel. IMO, It's unlikely legal counsel would advise against showing CCTV of a public incident, since there's nothing inherent in that which would undermine a fair trial. If there is more graphic footage out there, it's my guess that broadcasters and press simply don't want to show it because it's horrific. The seems to be in line with all similar incidents around the world where UK broadcasters sanitise what they show.
What legal counsel would advise against is editing the footage deceptively to support guilt or innocence. That would be contemptuous of the legal process. UK broadcasters generally do not do this, but social media posters do, and that is why the police issue these requests and warnings to the public.
Full quote, so you can see I only elided clauses that don't change the overall meaning:
"Merseyside Police specifically asked people not to share footage being circulated on social media as it might prejudice a future trial. So whilst you can go to X-twitter and see the final footage of the car's journey, you won't find that same footage in the national press because of contempt of court laws."