In order to use Vivecraft with Weeping angels, you will only need Vivecraft installed alongside forge. Although, if you wish to play on a server with this compatibility, the server you are playing on, must have Vivecraft Forge Extensions installed. You can find the download here: https://www.curseforge.com/minecraft/mc-mods/vivecraft-forge-extensions
Vivecraft, in itself, can be found here: http://www.vivecraft.org/
Note: Vivecraft Forge extensions being installed on a server, will not affect non-VR people. They do not require the mod to join the server.
The compatibility created between these two mods;
After this compatibility is created between them, the angels act exactly as you expect they would. In view? They're going to stop. But out of view….