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Apply shader to specific part of the screen


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Normally I use 

mc.entityRenderer.loadShader(new ResourceLocation("shaders/post/blur.json"));

to load a shader however, this puts the shader on the entire screen. How do I apply the blur shader on only a specific part of the screen?

I tried

Field resourceManager = EntityRenderer.class.getDeclaredField(Mapping.resourceManager); /* shaderGroup = isObfuscated() ? "field_147707_" : "shaderGroup"; */
Field shaderGroup = EntityRenderer.class.getDeclaredField(Mapping.shaderGroup); /* resourceManager = isObfuscated() ? "field_147711_ac" : "resourceManager"; */
Field useShader = EntityRenderer.class.getDeclaredField(Mapping.useShader); /* useShader = isObfuscated() ? "field_175083_ad" : "useShader"; */

shaderGroup.set(mc.entityRenderer, new ShaderGroup(mc.getTextureManager(), (IResourceManager) resourceManager.get(mc.entityRenderer), mc.getFramebuffer(), new ResourceLocation("shaders/post/blur.json")));

((ShaderGroup) shaderGroup.get(mc.entityRenderer)).createBindFramebuffers(300, 300);

useShader.setBoolean(mc.entityRenderer, true);

However, this shurk my entire screen and applied the blur filter there and resizing the window causes it to reset. Is there any way I am able to only blur the part of the screen I want and not just the entire screen? 

Screenshot 2020-10-25 110746.png

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