Several countries‘ governments have accused the Israeli government of genocide and asked the International Criminal Court to prosecute Israeli officials, but that court effectively answers to the U.S. government and has refused for years to prosecute crimes by Israel or anyone else outside of Africa.
But the International Court of Justice has ruled against Israel in the past, and if any one nation invokes the Genocide Convention, the court will be obliged to rule on the matter.
If the ICJ determines that genocide is happening, then the ICC will not need to make that determination but only consider who is responsible