At this time we are not supporting the PiCapture products with the Pi Zero.
The biggest issue are the connectors:
1) The Camera connector is different, although there are adapters that others are selling
2) We use the 40-pin connector to provide power
3) In order to use the PiVideo control software (for manual input source selection, etc.) we use the I2C or Serial ports from the 40-pin connector.
There should be no reason that a PiCapture board wouldn’t work if power were supplied and the MIPI CSI-2 ribbon were connected, but we haven’t tried it.