Thanks for contacting Toradex Community.
Can you please let us know which excat Colibri module you are using? Also such application need more processing and family like Apalis and Verdin should be considered for such requirement.
There are few ways to connect CCTV(Analog Camera) such as frame grabber modules over PCIe, USB3.0 or design your own circuit using such chip for specific use case.
Just to give one example Sensoray 1012 can be interfaced over miniPCie. Ofcource exact usecase and FPS needs to be considered while selecting such cards.
For further help for your requirement you can contact or share your details on firstname.lastname@example.org