This is the one I usually use: https://mvnrepository.com/artifact/org.openpnp/opencv

Example from the page:

<dependency>
    <groupId>org.openpnp</groupId>
    <artifactId>opencv</artifactId>
    <version>4.9.0-0</version>
</dependency>

Note that it uses a slightly different API from the official bindings:

https://github.com/openpnp/opencv?tab=readme-ov-file#api