I dont normally comment on videos but that is shocking
Nasty.
Obviously both motorists to blame through inattention but as in so many of accidents there must be something about visual perception that people don't necessarily see what is in front of them. Applying the principle that motorists have not necessarily seen you I keep looking at the video to try determine whether there is anything defensive that the cyclist could have done which in turn I could apply to my own cycling.
Speculating here but several extrinsic factors might have contributed to the accident. The white van that pulls across just before the accident might inadvertently have contributed. It blocks the woman's view of the road on her right as she approaches the junction. It also obscures the black car's view as he approaches the junction. As a result black car man has less time to see the cyclist than would otherwise have been the case.
The van gets across before the cyclist gets to the junction, but it is pretty fine. The road looks as though it is a downhill drag, so quite easy for the cyclist to pick up speed & perhaps this lead to the white van man underestimating his closing speed. It is a bit hard to tell from the video, but if I had been the cyclist I think I might have a bit worried about the white van guy turning as I was approaching at speed and might have been tempted to touch the brakes. In part, because I don't know what is behind the van and if there was something nasty it might have given a bit of extra wriggle space. Also seeing the white car approaching the junction on the left (but not having stopped at the time you loose sight of it because it is obscured by the white van) warning bells might have been sounding. Cars rolling towards, as distinct to stopped at junctions make me nervous as I feel there is a higher risk that haven't seen me & might pull straight out
This isn't to defend the motorists, and the cyclist isn't too blame, but as has been pointed out before the moral high ground isn't much use if you're splattered on the road.