It appears to show two officers in safety vests rejoining the other officers and retreat together. You see them first appear around 12 seconds in as the camera pans. They're walking towards the Capitol. If you try to keep you eye on the original officer who's waving, you see the two in the yellow vest actually following him back towards the Capitol.
Draw your own conclusions with this new information and the longer video.
stolen from a reddit thread about the video linked:
The person who originally shared this video as proof of Capitol Police involvement has gone back on his claim.
The originally shared tweet. Same as OPs.
The uncropped and longer version.
It appears to show two officers in safety vests rejoining the other officers and retreat together. You see them first appear around 12 seconds in as the camera pans. They're walking towards the Capitol. If you try to keep you eye on the original officer who's waving, you see the two in the yellow vest actually following him back towards the Capitol.
Draw your own conclusions with this new information and the longer video.