Will Quicktime support PPAPI? Does it already?

Quicktime is blocked in Chrome, IE Explorer, and Firefox, but not yet in Safari. Can I count on this being true in the future?
Let me explain my problem:
I'm developing a website that will show literally hundreds of video clips of American Sign Language. The linguists who will access this site will not know the language, but will need to view each video clip carefully, which means they will need: (1) subtitles of each sign; and (2) the ability to cursor through the clip frame by frame. So far my solution to this has been Adobe PDFs with Quicktime clips embedded in them since Quicktime is the only interface that has provided these abilities. Until recently, the only small website I have on this so far, at www.vincentasl.info (which has mostly audio, but some video), has worked fine: click on a small icon, and a window showing the video would open. But now suddenly the videos don't play - doubtless a security issue since Adobe is deprecating anything but Flash, whose interface will not provide the capabilities I need.You can see how this is supposed to work by going to the link below and downloading the PDF there to your hard drive before opening it (or just maybe it will have no problem in Safari).
https://www.dropbox.com/s/jcjxkdiqyj0cguf/ShortRapidHeadnods.pdf?dl=0
Testing to see if switching to an HTML interface will solve my problem, I found that Quicktime is blocked in Chrome, IE Explorer, and Firefox. One can click a button to allow it, but that is unsatisfactory for two reasons: (1) It will be a real nuisance to users to have to do this again and again for every single clip; and (2) What I have learned so far about this seems to say that NPAPI capabilities will be totally removed from those browsers later.
But hurrah! My clips work in Safari without so much as a complaint! Does this mean (a) that Apple has simply not decided to block it yet? Or (b) that they've solved the problem, and if I switch my whole developing system to HTML and tell my readers just to stick to Safari I'm out of the woods on this?
Thanks for your help.

Thanks for the links, but the first one appears to require Quicktime, and I thought the whole point was to try to use HTML5's built-in video player instead of a plug-in. The second one is encouraging to the degree that it tells us the problem is solved, but does not tell us what the solution is.
Turning to why my results differ from what you would expect, in hopes of shedding light on the matter, here are the three versions I've tried:
1. This code worked perfectly and immediately in Safari for the PC (version 5.1.7, which is the latest available), and perfectly in chrome and IE, although not immediately since one must pause to give permission:
<html>
<head>
</head>
<body>
<embed src='124_1583 ix rock, ix get lotta moneyQ.mov' controller='true' height='350' width='460'
  target='quicktimeplayer'>
</body>
</html>
2. This code (without the supposedly required end video end tag!) works immediately in Safari but imperfectly in that the only frame by frame capability is clicking within the progress bar at random locations. It does not work at all in Chrome or IE.
<html>
<head>
</head>
<body>
<video width="460" height="350" controls
  <source src="124_1583 ix rock, ix get lotta moneyQ.mov" type="video/mov">
</body>
</html>
3. This code (even though it has the supposedly required end tag - as per example code on the web) does not work at all in any of the browsers I've tested, including Safari.
<html>
<head>
</head>
<body>
<video width="460" height="350" controls>
  <source src="124_1583 ix rock, ix get lotta moneyQ.mov" type="video/mov">
Your browser does not support the video tag.
</video>
</body>
</html>

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