To install Wi-Fi cameras in cars, first of all, you need to find a good IP camera model. CameraFTP does not sell cameras, and we are not familiar with such cameras...
Please note your camera needs to be connected to the Internet for cloud recording. If it is installed in a car, most likely you need a mobile data service (e.g. 4G wireless connection). You might be able to find an IP camera with 4G capability. If so, please share the info here.
Alternatively, you can use a mobile hotspot, or mobile (4G) access point. You can then use a regular Wi-Fi IP camera connected to the mobile hotspot.
Another solution is to use a smart phone as an IP camera. You can install CameraFTP Mobile Security Camera app for iOS / Android.