I recently purchased an Ezviz DB1 video doorbell, I wrote about my install and setup on my blog here.
I have the doorbell button press triggered in Vera using the dry contact input on an Everspring SM103 door contact sensor and using Http Json commands sent from Blue Iris I was able to create a virtual motion sensor device in Vera and have it work based upon motion alerts from the DB1 doorbell camera.
Read my blog post for more details.