HDMI direct write to frame buffer

I am using a jetson AGX and I want to use HDMI to write directly image or video.
I have followed this
I was able to disable ubuntu desktop and send the sample video but cannot use image.
In another hand, I have tried to use framebuffer but nothing happen on image as in this post c - How to get pixel colour from framebuffer on linux (Raspberry Pi) - Stack Overflow

Any help please ?

Directly accessing framebuffer is not supported. Please check the related post:
Alternatives to directly writing framebuffer? - #4 by DaneLLL

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