#0. Yes sliding navigation needed desktop & mobile
I’m testing this
#1. Image reveal on scroll to full screen then text revel on scroll over image
Possibly, except that clicking the circle dot on the right will produce a similar effect when scrolling.
With circle dot on left side > Click it will scroll to corresponding section + make text reveal over image, we can do this.

#2. Button Design
Hover button will change opacity + move text to left + arrow appear?

#3. Frosted image reveal on scroll (only images above fold)
You mean effect with header on scroll over image?

Or you mean frosted around this image? (see red highlight)

#4. Image reveal larger on scroll
#5. Auto gallery reveal with auto revel buttons with timing rings
I don’t see this effect. Which page are you referring to or do you have video of effect?
#6. custom video play icon
Change video play icon to custom icon is possible, I don’t see video icon on example site. Do you have a screenshot?
#7. Parallax on single image
I don’t see this effect. Which page are you referring to or do you have video of effect?
#8. Have a small click button (tick in circle) under text to reveal more information, the interaction reveals the text beneath (expand/collapse)
Yes. This is possible, I used to do similar request, you can provide screenshot of effect or link to page on example site, I can check easier.
#9. And a small Audio play button ( small speaker in circle) when activated plays audio with time left and volume + & –
Add it over image or which position? and on one page or all pages?