The trial of a couple accused of plotting to attack the B.C. Legislature on Canada Day has heard that the pair considered backing out only hours before the planned attack.

But footage shown in court from a hidden RCMP video camera shows John Nuttall and Amanda Korody eventually deciding it's too late to turn back.

The pair face four terrorism-related offences after allegedly conspiring to plant pressure-cooker bombs on the Legislature lawn in Victoria.

In surveillance tape from June 30, Nuttall becomes agitated as he complains that an Arab businessman and his accomplices are pressuring them to rush the plan.

The businessman and his collaborators are undercover police officers.

At one point in the video, Nuttall wonders out loud whether he and Korody have been caught in a police sting.

Both have pleaded not guilty to all charges.