Hello Sahil, as a few first troubleshooting steps, definitely be sure to set the “gpu_mem” variable, many folks miss that.
But beyond that, are all of the containers downloaded and running? Are there any errors in the Logs? And, of course, definitely try rebooting the device, just to be safe.
Additionally, what kind of a Raspberry Pi is it? What kind of a camera? Does the camera work in Raspbian?