replace images with video for animation and variants

Author: parashivbrl

docs/show_animation_clips.md

@@ -2,7 +2,10 @@
 
 The Animation Clips Manager allows you to view and manage animation clips associated with imported GLTF/GLB files. This interface provides an organized way to access different animations contained within your 3D assets.
 
-![Screenshot](img/image_animation_clips.png)
+<video controls>
+  <source src="vid/animation_clips_demo.mp4" type="video/mp4">
+  Your browser does not support the video tag.
+</video>
 
 *Courtesy by Khronos glTF sample assets*
 

docs/show_material_variants.md

@@ -2,7 +2,10 @@
 
 The Material Variants Selector allows you to browse and apply different material configurations available in your GLTF/GLB files. This feature is particularly useful when working with assets that contain multiple material variations for the same model.
 
-![Screenshot](img/image_material_variants.png)
+<video controls>
+  <source src="vid/material_variants_demo.mp4" type="video/mp4">
+  Your browser does not support the video tag.
+</video>
 
 *Courtesy by Khronos glTF sample assets*