You can't power a delay circuit from the camera terminals. Excluding that, there many other ways to make a shutter delay.
Here is relay solution. Relays RLY1/2 can be small 12V reed relays. The delay is determined by the coil resistance, the capacitor size, and the relay's pull-in voltage. R1 discharges the capacitor after the trigger relay opens. The value is not critical, but it limits the time before the camera can again be triggered with a shutter delay.
Ken