Conspiracy theorist materials, including signs saying “There is no pandemic” and “The truth will win” were pasted on the double floor.
The footage appears to show members of the public and a bus driver trying to remove stickers covering the vehicle’s windshield.
The incident occurred as hundreds of people joined in Parliament Square for a Unite for Freedom rally alongside another Kill the Bill protest.
Some protesters carried signs reading “My body, my choice” and “We are not guinea pigs” while others accused the press of “lying” about the virus.
Many expressed their belief that the pandemic was a hoax and others also opposed the idea of vaccine passports.
Several people set off smoke bombs and one launched fireworks, with many of the crowd believed to have traveled from outside London for the rally, Metro reports.
One man, who did not give his name, told the PA news agency that he came “because I want to be free and I want you to be free and the government is lying to us.”
Another said she attended because the press “lies to us”.
At around 1:20 p.m., the crowd had started to disperse and head towards Whitehall, with some heading towards Trafalgar Square where the bus was found.
The protest comes just a day after Johnson and Johnson’s single dose Covid vaccine was given the green light by the UK Medicines and Health Products Regulatory Agency (MHRA).
This is the fourth coronavirus vaccine approved for use, after those manufactured by Pfizer, AstraZeneca and Moderna.
Jabs are seen as more crucial than ever in tackling Covid amid the spread of the Indian strain of the virus.
Ministers urged anyone who is eligible to come forward and be vaccinated to help eliminate the variant.
Some scientists are advising the government to delay the final lifting of restrictions on June 21 until more people are vaccinated.
Cases topped 3,000 for the second day in a row last week – the first time infections have reached this level since mid-April. More than 3.5 million people worldwide have died from the virus.
Boris Johnson said it was too early to comment on his decision on the date, but promised to provide an update on June 14.
Today’s rally is said to be the largest since an anti-containment protest in the capital last month attended by failed mayoral candidates Laurence Fox and Piers Corbyn.
Two policemen had to be hospitalized after trying to disperse the crowd during the march and five people were arrested.
Hundreds of protesters attended a separate rally in Russell Square today to discuss the Police, Crime, Sentencing and Courts Bill.
Critics say the new legislation will limit the public’s right to protest.
Met police have asked people to “comply with restrictions that apply to large gatherings” in an open letter to those demonstrating this weekend.