The Tuya API does not provide camera access. Your only option here is to use the Home Remote’s generic IP Camera device & even that, I’m not sure if it will work. I don’t know if they give access to those streams to 3rd parties. You can try contacting their support to see if they can give you the RTSP or HTTP MJPEG streaming URLs.
Your best option is to buy an ONVIF supported camera. Those are built to provide easy 3rd party access. Or find a camera manufacturer that openly shares their cameras’ streaming URLs. There are quite a few out there.